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County of Los Angeles Department of Public Works

Private Drives and Traffic CalmingDesign Guidelines Manual

June 2009

Private Drives and Traffic Calming Design Guidelines Manual

Table of Contents

1) INTRODUCTION...............................................................................................

2) DESIGN GUIDELINES ..................................................................................... 2

a. Design Speed .................................................................................................. 2b. Sight Distance ................................................................................................. 2c. Horizontal Geometry ...................................................................................... 2

i. Centerline Curve Alignment ............................................................ 2ii. Intersection Design .......................................................................... 3iii. Tangents 3iv. Medians 3v. Curb Extensions ................................................................................ 3vi. Roundabouts and Traffic Circles ...................................................... 4vii. Gates 4

d. Vertical Design ................................................................................................ 4i. Grades 4ii. Landings 4iii. Grade Breaks and Vertical Curves ...................................................... 5

e. Signing and Striping ........................................................................................ 5

f. Structural Design ............................................................................................. 5i. Pavement Design ................................................................................. 5ii. Design Criteria .................................................................................... 5

3) IMPLEMENTATION ......................................................................................... 6a) Tentative Map ................................................................................................... 6b) Final Engineering .............................................................................................. 6c) Construction ...................................................................................................... 6

4) ACKNOWLEDGMENTS .................................................................................... 7Document Preparation TeamSpecial Acknowledgment

5. APPENDIX ............................................................................................................ 8Fig. 1 a Private Drive-Local Cul-De-Sac w/Parallel Parking ........................... A-1Fig. lb Private Drive-Local—No Parking .......................................................... A-2Fig.2a Private Drive-Residential Collector w/Parallel Parking ...................... A-3Fig.2b Private Drive-Residential Collector w/Mountable Median Curb—No

Parking ............................................................................................ A-4Fig .2c Private Drive-Residential Collector w/Mountable Median Curb—No

Parking ............................................................................................ A-5Fig.3a Private Drive-Rural w/Parallel Parking ................................................ A-6Fig.3b Private Drive-Rural w/Inverted Shoulder ............................................. A-7Fig.4 Private Drive-Gated Entry Residential ................................................. A-8Fig.5 Private Drive-Urban w/Parallel Parking ............................................... A-9

June 2009


Fig.6a Private Drive-Local Collector-No Median w/Angled Parking ............. A-10Fig.6b Private Drive-Local Collector w/ Median w/Angled Parking .............. A-11Fig.6c Private Drive-Local Collector-w/Median w/Angled Parking ............... A-12Fig.7a Private Drive-One Way w/Parallel Parking On One Side ..................... A-13Fig.7b Private Drive-One Way—No Parking ........................................................ A-14Fig,8a Private Drive-Alley-No Fire Access ......................................................... A-15Fig.8b Private Drive-Alley...................................................................................... A-16Fig.9 Industrial/Commercial Loop—Private Drive ............................................ A-17Fig. 10 Typical Gate Detail With Guard Shack .................................................... A-18Fig. 11 Typical Gate Detail Without Guard Shack .............................................. A-19Fig. 12 Typical Private Drive Local Intersection 3-Way Traffic Calming

Detail ...................................................................................................... A-20Fig.13 Mid Block Traffic Calming Detail ........................................................... A-21Fig.14 Typical Horizontal Geometry Private Drive Rural ................................ A-22Fig. 15 Concrete Rolled Curb ................................................................................ A-23

June 2009


Section 1 Introduction

Developers are increasingly proposing and/or requesting to incorporate "privatedrives" within their developments. The intent is to provide a local circulationsystem that encompasses the concept of smart growth and livable communities,land planning principles, aesthetics and water quality while balancing traffic flow,pedestrian safety, and maintaining access for emergency vehicles.

A Private Drive, as referred to in these guidelines, is defined as a local road thatwill be privately maintained and will not be eligible for transfer to Los AngelesCounty for ownership nor maintenance.

Specific design elements may be modified to accommodate the Low-ImpactDevelopment (LID) Ordinance adopted by the County of Los Angeles.

Street elements have been modified to achieve design criteria for private drives.These elements include: centerline radii, street grades, street widths, parkways,and sidewalks.

The following references were used to develop the design criteria for privatedrives (but were modified where necessary to incorporate the various elementslisted above):

o Los Angeles County Title 21o Los Angeles County Fire Design Guidelineso AASHTOo FHWAo California Department of Transportation (Caltrans)

These guidelines have been established for the following reasons:

o To ensure that private drives incorporate minimum access designstandards for emergency vehicles.

o To assist in the review of tentative maps, preparing conditions of approvalfor corresponding tract development, and reviewing and approvingcorresponding plans.

Design speeds and sight distance criteria utilized for these guidelines are basedupon AASHTO, Los Angeles County, and Caltrans standards, where appropriate.All design charts and tables in the available publications are referenced herein.

This manual will be a living document and may be periodically revised orupdated.

June 2009


Section 2 Design Guidelines

This section establishes the design guidelines and criteria to be used in designing andreviewing the Private Drives located in the Westside Communities. The criteria containedherein, are the minimum design criteria for specific classifications of Private Drives. Thespecific cross-sections and design criteria are located in the Appendix. A discussion ofthe standards and criteria to be used follows below.

a) Design Speed

Alleys Minimum design speed of 15 mph.

Local (through) streets: Minimum design speed of 20 mph.

Collectors: Minimum design speed of 30 mph.

Hillside conditions: Minimum design speed of 15 mph (Local)Minimum design speed of 25 mph (Collector)

"Hillside conditions" will be defined as consistent with the latest Countydesignation for streets.

Design Exceptions:

Where design constraints or site design elements require the use of reduced designspeeds or centerline radii, exceptions may be allowed with LACDPW approval.The designer must demonstrate that the land use, traffic volumes, and signage areappropriate for the design exception requested.

b) Sight Distance

Stopping sight distance and intersection sight distance should be based upon thedesign speed shown on the private drives cross-sections and the criteria defined inthe AASHTO guidelines.

Where medians are utilized, landscaping and obstructions within the mediansneed to be minimized within the stopping and intersection sight distance setbacks.

c) Horizontal Geometry

i) Centerline Curve Alignment

The minimum centerline curve radii used for standard local and collectorprivate drives are defined in the typical design sections following. In hillsideconditions, reduced centerline curve radii are utilized consistent with the

2June 2009


reduced design speeds. AASHTO guidelines allow radii as low as 100 feet forlocal streets. The minimum length of all curves is 100 feet, measured outsideof the intersection curb returns.

ii) Intersection Design

Intersecting drives should intersect as close to 90 degrees as possible. Themaximum angle of deflection between two intersecting private drivecenterlines is 20 degrees.

Per AASHTO, intersection sight distance should be based upon a 7 secondminimum for a driver of a passenger vehicle to pass through the through lanes.Where adequate sight distance cannot be provided for 4-way intersections,adequate controls consistent with Section e. Signing and Striping shall beutilized.

iii) Tangents

Short tangents between successive curves should be avoided. Minimumtangents for reversing and broken back curves are included on the design crosssections located in the Appendix.

Where adequate tangents cannot be provided, reversing and compound curveswith no tangents should be utilized. For compound curves, the radius or thesmaller curve must be a minimum 2/3 of the larger radius.

iv) Medians

Medians can be utilized for aesthetics and traffic calming purposes. Whenutilized, medians will have a minimum width of 14 feet unless otherwiseapproved. Landscaping and visual obstructions in the medians must beminimized within the intersection and stopping sight distance lines of sight.

Medians exceeding 400 feet must be broken, or a mountable and hard drivablesurface added at a maximum distance of 400 feet if no emergency turnaroundor alternate route is available for emergency vehicles. All drivable surfacesmust be designed to accommodate the wheel loads of the County FireDepartment design vehicles.

v) Curb Extensions

Restricting the width of intersections through the use of "curb extensions"may be desired to promote traffic calming and pedestrian safety. The locationand frequency of the curb extensions are to be based upon therecommendations of the traffic consultant and subject to County approval.Typical details can be found in the Appendix.

3June 2009

Private Drives and Traffic Cahning Design Guidelines Manual

vi) Roundabouts and Traffic Circles

If a roundabout is utilized for traffic factors, the design must be consistentwith the latest "Roundabout Policy and Practices for Los Angeles County".

Traffic circles may be utilized for architectural and / or aesthetic purposeswhere low traffic volumes are expected. The designer must demonstrate that afire truck and tractor trailer truck can safely negotiate the traffic circle.Intersection and stopping sight distance requirements must also be satisfied.Design vehicles utilized will be based upon the latest LACDPW and LACFDdesign guidelines.

vii) Gates

The design and dimensions of all gated entries should be based upon thestacking distance determined by a traffic analysis and approved by theCounty. The stacking distance must be adequate to eliminate queuing ontopublic streets during peak hours of operation. The minimum dimensions for agated entry can be found in the Appendix.

d) Vertical Design

i) Grades

The maximum centerline grade of 10% will be allowed for standard local andcollector private drives. In hillside conditions, a maximum of 15% is allowedwith the following constraints:

• All effort should be made to use a maximum grade of 10%.• The use of grades over 10% result in reduced grading or visual

impacts.• No intersections are allowed where grades exceed 10%.• Grades greater than 10% should be utilized for short distances.• When grades exceed 10%, the maximum grade differential between

the adjacent incoming street grades is 5%.

ii) Landings

Landings are required on all side private drives entering the main privatedrive. A maximum landing grade of 3% will be used in all conditions with theexception of hillsides, where 5% may be utilized.

The minimum landing length is included in the typical design cross-sectionsin the Appendix. The landing is defined as that portion of the side streetbeyond the curb projection of the through street.

4June 2009


iii) Grade Breaks and Vertical Curves

A maximum grade break of 1% every 15 feet is allowed.

Where grade breaks exceed 1%, vertical curves will be utilized, consistentwith the Caltrans Highway Desi gn manual.

e) Signing and Striping

All signing and striping should be based upon the Manual on Uniform TrafficControl Devices (MUTCD) - consistent with AASHTO, Caltrans guidelines,and the California Vehicle Code. Directional and warning signage andstriping should be used as required for safety.

f) Structural Design

i) Pavement Design

All standard pavement, enhanced pavement, and pavers structural sectionsshould be designed consistent with the guidelines outlined in the Caltrans andAASHTO design manual, or applicable manufacturer's design specifications.

ii) Design Criteria

All design should be based upon a reasonable TI (Traffic Index) provided by atraffic engineer. The pavement section must be designed to accommodate aLACFD design vehicle (75,000 pounds), as well as the standard Caltransdesign vehicle. A minimum TI of 4 is recommended by the Fire Departmentfor access limited to emergency vehicles. A soils consultant shall be employedto provide recommendations for structural sections.

5June 2009


Section 3 Implementation

This section establishes the procedures and process for the planning and design phases ofthe project.

a) Tentative Map

The LACDPW Land Development Division - Road and Grading Section willreview all proposed private drives for adherence to the guidelines and designcriteria established in these guidelines. The LACDRP and LACFD may alsoreview and comment on the proposed use of private drives and address anydiscretionary approvals required by these guidelines. All Conditions of Approvalcorresponding to private drives will be prepared in reference to these guidelines.However, LACDPW Land Development Division may use their discretion if theuse of a proposed cross section is deemed undesirable.

b) Final Engineering

All private drives will be reviewed by the LACDPW Land Development Division— Road and Grading Section for adherence to the guidelines and design criteriaestablished in these guidelines.

LACDPW Geotechnical and Materials Engineering Division - Soils and GeologySection will review the pavement structural sections.

Private drive details will be reviewed as part of the grading improvement plansand will consist of 1"=40 plans with a centerline profile. The plans will includestreet stationing, horizontal and vertical geometry annotation, and constructionnotes.

Plan check fees will be based upon the valuation of the proposed improvementsconsistent with normal road and grading plan check fees.

c) Construction

All construction will be supervised as a part of the grading permit. Constructionof the road structural section will be confirmed by the soils engineer and includedwith the final grading certification. The civil engineer will certify that thedrainage and grading improvements have been constructed as shown on the plan.

6June 2009


Section 4 Acknowledgements

Document Preparation Team

The following members of the Private Drives and Traffic Calming Design GuidelinesManual Committee contributed to the formulation of this document:

Andy Narag — Land Development

Sam Richards — Land Development

Steve Sheridan — Land Development

Janna Masi — Fire Department

Special Acknowledgement

Public Works would like to acknowledge and thank the following individuals forproviding technical support in the formulation of this document.

Mr. Jason H. Fukumitsu, P.E.Hunsaker and Associates, LA, Inc.26074 Avenue Hall, #23Valencia, California 91355Office: (661) 294-2211E-mail: ifukumitsu hunsaker.com

A special thank you to Corey Harpole, Newhall Land, who provided funding and moralsupport in the formulation of this document.

7June 2009


Section 5 Appendix

8June 2009

2

1

2%

C/LP/L OR

EASEMENT

1 2'

STANDARDPARKWAY

(58' MIN.)

29' MIN.

1 7'

MIN.

ALTERNATEPARKWAY(50' MIN.)

25' MIN.

1 7'

MIN.

P/L OREASEMENT

8' MIN.

2 7' 20' 7'

MIN.

0'OR

7'

2%PARKING PARKING

1.8% 1.8%

5' SIDEWALK 3

6" CURB & GUTTER (Pr?)

5' MIN. MEANDERING WALKIN AND/OR OUT OF P/L3

PRIVATE DRIVE-LOCAL CUL-DE-SAC 4

W/ PARALLEL PARKINGN.

DESIGN DATA

STANDARD ALTERNATEMIN. OVERALL WIDTH (ft) 58 50MIN. CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

34 345 5

LAND USE SINGLE FAMILY RESIDENTIAL, DETACHED CONDOMINIUMS,DUPLEXES, LOCAL MIXED USE, OPEN SPACE, PARK

ADT VOLUME (SF UNITS SERVED) 2 900 ADT(100)

STANDARD HILLSIDEDESIGN SPEED (mph) 20 1 5

MINIMUM C/L RADIUS (ft) 1 00 1 00

MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) 1 200 1 50

COMPOUND CURVE RADII (ft) 2/3 R1 � R2 5-Ri 2/3 Ri � R2 5-R1

MAXIMUM GRADE 1 0% 1 5%

MAXIMUM LANDING GRADE 3% 5%

MINIMUM LANDING LENGTH (ft) 50 25RESTRICTIONS MAY BE USED AS ACCESS TO MULTI-FAMILY <35' IN

HEIGHT ON A CASE BY CASE BASIS. MAXIMUMCUL-DE-SAC LENGTH=700'

1. ELIMINATE TANGENT IF MINIMUM TANGENT LENGTH CANNOT BE SATISFIED.2. ADT VOLUME ANALYSIS IS THE BASIS OF DESIGN AND SUPERCEDES UNITS

OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. MAY BE APPROVED AS A THROUGH STREET ON A CASE BY CASE BASIS.

DATE: JUNE 2009A- 1

1 3'1 2' 8'1 3'MIN. MIN.

1.8%

MIN

2%

MIN,

1.8%

P/L OR STANDARDEASEMENT PARKWAY

(50' MIN.)

C/L ALTERNATE PA. ORPARKWAY EASEMENT(42' MIN.)

25' MIN. 21' MIN.

-Ii2 2

1

6" CURB & GUTTER (TYP)5' SIDEWALK 3


PRIVATE DRIVE-LOCAL' NO PARKING

N.T.S.

DESIGN DATA


26 265 5

LAND USE SINGLE FAMILY RESIDENTIAL, DETACHED CONDOMINIUMS, DUPLEXES,MULT1-FAMILY RESIDENTIAL, LOCAL MIXED USE, OPEN SPACE, PARK

ADT VOLUME (SF UNITS SERVED) 2 3,600 ADT(400)


MINIMUM C/L RADIUS (ft) 200 1 00


COMPOUND CURVE RADII (ft) /31R15- R2 � R1 /3R1.5. R2 -�-1R 1MAXIMUM GRADE 1 0% 1 5%


MINIMUM LANDING LENGTH (ft) 50 25RESTRICTIONS RESTRICTED OR LIMITED DRIVEWAY ACCESS, NO PARKING,

NO EMERGENCY FIRE SETUP REQUIRED FOR BUILDINGS,ENTRY OR STRUCTURES LESS THAN 35' SUBJECT TO REVIEW.


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. CAN BE USED AS A COLLECTOR ON A CASE BY CASE BASIS.

DATE: JUNE 2009A-2

2-I 7

C/LP/L OR

EASEMENT STANDARDPARKWAY

(60' MIN.)


P/L OREASEMENT

30' MIN. 26' MIN,

_ 12' 1 8' MIN. 1 8' MIN. _ _ 8'_MIN. --

0'

OR 7' PARKING

8' 20 MIN. 8' MIN.

PARKING

2Z1.8% 1.8%

6" CURB & GUTTER (TYP)

5' SIDEWALK3

5' MIN. MEANDERING WALK

2

IN AND/OR OUT OF P/L3

PRIVATE DRIVE-RESIDENTIAL COLLECTORW/ PARALLEL PARKING

DESIGN DATAN. S.


36 365 5

LAND USE SINGLE FAMILY RESIDENTIAL, DETACHED CONDOMINIUMS,

MULTI-FAMILY RESIDENTIAL<35', LOCAL MIXED USE, OPEN SPACE, PARK


STANDARD HILLSIDEDESIGN SPEED (mph)4 30 25


MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) 1 200 1 50COMPOUND CURVE RADII (ft) 27/31R1-� R2 SR1 2/3R1 � R2 -� R1



MINIMUM LANDING LENGTH (ft) 1 00 50RESTRICTIONS


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. LOWER DESIGN SPEEDS MAY BE UTILIZED CONSISTENT WITH THE MANUAL.

DATE: JUNE 2009A-3

5 SIDEWALK

DESIGN DATA

C/LP/L OR

EASEMENTSTANDARDPARKWAY

ALTERNATEPARKWAY

P/L OREASEMENT

2

/LS MIN.) /(_). mIN439' MIN. 35' MIN.

1 2' 20' MN .5 1 4 20' MIN.5

'MIN,

OR

,VARIES 5'-7'

1VARIES 5'-7'-\

I

2%

1' SAFE7Y I

STRIP (TY.. P) IIBL

Al4KNEE1

1.8% I2%

4 I MOUNTABLEBIKE I CURBLANE ' (Typ )1 1.8%

2

6" CURB & GUTTER (TYP)5' MIN. MEANDERING WALKIN AND/OR OUT OF P/L 3

PRIVATE DRIVE-RESIDENTIAL COLLECTORW/ MOUNTABLE MEDIAN CURB

NO PARKINGN.T.S.


54 545 5

LAND USE SINGLE FAMILY RESIDENT AL, DETACHED CONDOMINIUMS,

MULTI-FAMILY RESIDENTIAL, LOCAL MIXED USE, OPEN SPACE, PARK

ADT VOLUME (SF UNITS SERVED) 23,600 ADT(400)

STANDARD HILLSIDEDESIGN SPEED (mph)6 30 25


MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) 1 200 1 50COMPOUND CURVE RADII (ft) /3Ri.� R2 � R 1 /3Ri � R2 � R1



MINIMUM LANDING LENGTH (ft) 1 00 50RESTRICTIONS LIMITED DRIVEWAY ACCESS.

MEDIAN PLANTING MUST ACCOMMODATE SIGHT DISTANCEAT INTERSECTIONS.ENTRY DRIVE OR STRUCTURES LESS THAN 35' SUBJECTTO REVIEW.

1.ELIMINATE TANGENT IF MINIMUM TANGENT LENGTH CANNOT BE SATISFIED.2.ADT VOLUME ANALYSIS IS THE BASIS OF DESIGN AND SUPERCEDES UNITS

OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. BIKE LANE OPTIONAL-NOT REQUIRED.5. WHEN ROAD ACCESS TO STRUCTURES IS NOT REQUIRED FOR EMERGENCY VEHICLES.6. LOWER DESIGN SPEEDS MAY BE UTILIZED CONSISTENT WITH THE MANUAL.

DATE: JUNE 2009A-4

1' SAFETY

r STRIP (TYP)

1.8% 1.8% 2%

2

P/L OREASEMENT

MIN.0'

OR

1 2'

STANDARDPARKWAY

(82' MIN.)C/L


P/LEASEMENT

OR

43' MIN 39' MIN.24' MIN.4 1 24' MIN.4

MIN.

2

5' SIDEWALK S

•" CURB & GUTTER ( p)

MOUNTABLE CURB


PRIVATE DRIVE-RESIDEN11AL COLLECTOR4

W/ MOUNTABLE MEDIAN CURBNO PARKING

N. T.

DESIGN DATA


62 625 5




STANDARD-

HILLSIDEDESIGN SPEED (mph)5 30 25


MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) 1

200 1 50COMPOUND CURVE RADII (ft) 3/3R1 � R2 � Ri 2/3R1 � R2 � R1



MINIMUM LANDING LENGTH (ft) 1 00 50RESTRICTIONS LJMITED DRIVEWAY ACCESS.

MEDIAN PLANTING MUST ACCOMMODATE SIGHT DISTANCEAT INTERSECTIONS.


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. WHEN ROAD ACCESS TO STRUCTURES IS REQUIRED FOR EMERGENCY VEHICLES.5. LOWER DESIGN SPEEDS MAY BE UTILIZED CONSISTENT WITH THE MANUAL.

DATE: JUNE 2009A-5

P/L

3'PUBLICUTILITY

EASEMENT

EASEMENTOR P/L

C/L EASEMENT1

42' MIN

OR

3'PUBLICUTILITYEASEMENT

21' 21'

8'3...-

26'-

CLEAR 8'3

DECOMPOSEDOR APPROVED

2-17

GRANITEEQUAL

CONCRETEROLLEDPER FIG,

DESIGN DATA

PARKING 1 3' 1 3' PARKING 11

1 2ii----FLOWLI NE

ASPHALTCONCRETEPAVING

PRIVATE_

DRIVE-RURAL

3"-4"

CURB1 5

41!) W/ PARALLEL PARKINGN.

STANDARD ALTERNATEMIN. OVERALL WIDTH (ft) 42 N/AMIN, CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

N/A N/AN/A N/A

UTILITY

LAND USE SINGLE FAMILY RESIDENTIAL 4 DUS/AC

ADT VOLUME (SF UNITS SERVED) 2

- 1,800 ADT(200)



MIN. TANGENT REVERSING CURVE (ft) 1 100 1 00MIN. TANGENT BROKEN BACK CURVES (ft) 1 200 1 50

COMPOUND CURVE RADII (ft) 3/3R1 �. Ft2 SRI 2/3 Ri � R2 SR1



MINIMUM LANDING LENGTH (ft) 50 25

RESTRICTIONS

DATE:


OR BUILDING AREA.3. OTHER IMPROVEMENTS, INCLUDING LANDSCAPING, STREET LIGHTS, FIRE HYDRANTS,

STRUCTURES AND OTHER FACILITIES MAY BE LOCATED WITHIN THE 8' PARKING AREA.

JUNE 2009A-6

P/L

,

3b

EASEMENTOR

C/L

40'

P/L

MIN.

EASEMENTOR

20' 20'

18' 18'

4'14' 14'

4'2'

MIN.MIN.

DESIGN DATA

.',..0

1.,_1.87 1.87

PAVEDSHOULDER

PRIVATE DRIVE-RURAL

NVERTED

W/ INVERTED SHOULDER

STANDARD ALTERNATEMIN. OVERALL WIDTH (ft) 40 N/AMIN. CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

N/A N/AN/A N/A

LAND USE SINGLE FAMILY RESIDENTIAL 4 DUS/AC

ADT VOLUME (SF UNITS SERVED)2

900 ADT(100)


MINIMUM CA RADIUS (ft) 200 1 00


COMPOUND CURVE RADII (ft) /3Fi1 � R2 � R1 2/3R15- R2 � 1R1MAXIMUM GRADE 1 0% 1 5%


MINIMUM LANDING LENGTH (ft) 50' 25'

RESTRICTIONS

DATE:

,1. ELIMINATE TANGENT IF MINIMUM TANGENT LENGTH CANNOT BE SATISFIED.2. ADT VOLUME ANALYSIS IS THE BASIS OF DESIGN AND SUPERCEDES UNITS

OR BUILDING AREA.

JUNE 2009A-7

2-1 1

DATE:

P/LEASEMENT

OR STANDARDPARKWAY

(78' MIN.)

C/L

ALTERNATE P/L

PARKWAY EASEMENT(70' MIN.)

3WALK2

OR

21 (---

39' MIN. 35' MIN.

12' 20' MIN. 4' MIN. 20' MIN 8'

DESIGN

--t-

5'IN

MIN.

OR

& GUTTER

PRIVATE

(TYP)

1' SAFETY

STRIP (TYP.)

MIN.

2 0

OF P/L

A19)

7'

2%

AND/OR

(SEE

DATA

. --67"---C71.1RE?

MIN. MEANDERING WALKOUT OF P/L 3

4 DRIVE-GATED

5' MIN. ME4NDERINGI N AND/OR OUT

ENTRY RESIDENTIALN.T.S.

GATE DETAILS FIG. 10 AND 11 ON PAGES A18 AND


54 545 5




STANDARD HILLSIDEDESIGN SPEED (mph) 30 25


MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00

MIN. TANGENT BROKEN BACK CURVES (ft) 1 200 1 50

COMPOUND CURVE RADII (ft) 2/3R1 � R2 � R1 2/3R1 �- R2 � R1



MINIMUM LANDING LENGTH (ft) 1 00 50

RESTRICTIONS LIMITED DRIVEWAY ACCESS


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.

JUNE 2009A-8

C/LP/L OREASEMENT

STANDARDPARKWAY

ALTERNATEPARKWAY

P/L OREASEMENT

UILDING(68' MIN) (58' MIN)

BUILDING-,34' MIN 29' MIN1 2' 22' 22 7'

5'0'

OR 8'

MIN

1 4'

MIN

14' 8'MIN

MIN 7' PARALLELPARKING

MIN MIN PARALLELPARKING

2 0

1.8% 1.8%2%

5' MIN SIDEWALK(TYP) 3 CURB (Sc GUTTER (TYP)

3

7 MIN SIDEWALK

DESIGN DATA

PRIVATE DRIVE-URBANW/ PARALLEL PARKING

N.T.S.


44 445 7

LAND USE MULTI—FAMILY RESIDENTIAL, MIXED USE,COMMERCIAL




MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) / 200 1 50

COMPOUND CURVE RADII (ft) 2/3R15. R2 � R1 2/3R1 � R2 5- R1






DATE: JUNE 2009A-9

2' OVERHANG(NO OBSTRUCTIONS)

16' 14'


14' 16'ANGLEDPARKING

MIN

1.8%

MIN

1.8%

ANGLEDPARKING

MIN

2%

BUILDINGBUILDING

2%

MIN

0'OR

C/LPA OREASEMENT

STANDARDPARKWAY(84' MIN)

ALTERNATEPARKWAY(74' MIN)

P/L OREASEMENT

42' MIN 37' MIN

12' 30' MIN 30' MIN 7'

6" CURB & GUTTER (TYP)ALT. 5' MIN SIDEWALK(TYP) 14,// FED. ACCESS7' WHEN CURB ADJACENT 3

7' SIDEWALK3

PRIVATE DRIVE-LOCAL COLLECTOR-NO MEDIANW/ ANGLED PARKING

N.T.S.

DESIGN DATA


60 605 7

LAND USE MULTI-FAMILY RESIDENTIAL, MIXED USE,COMMERCIAL


3,600 ADT(400)




COMPOUND CURVE RADII (ft) 2/3R1 � R2 � R1 2/3R15- R2 � RiMAXIMUM GRADE 1 0% 1 5%





DATE: JUNE 2009A-10

12' 16' 20'4 14'MIN ANGLED

PARKINGMIN. MIN,

BUILDING

- 2' OVERHANG(NO OBSTRUCTIONS)

OR

1.8%2%

P/L OR STANDARDEASEMENT PARKWAY

C/LALTERNATEPARKWAY

P/L OREASEMENT

(110' MIN) (100' MIN)

55' MIN.4 50' MIN.420' 4 16'

IBUILDING

6" CURB & GUTTER (TIP)ALT. 5' MIN SIDEWALK(TYP) W/ FED. ACCESS7' WHEN CURB ADJACENT3

PRIVATE DRIVE-LOCAL COLLECTOR-W/ MEDIAN4W/ ANGLED PARKING

DESIGN DATA N.T.S.

MIN. ANGLEDPARKING


1' SAFETY

STRIP (UP.)

1.8%

MIN.

2%

37' MIN. SIDEWALK-I

\-- 6" MEDIAN CURB & GUTTER (TYP)

STANDARD ALTERNATEMIN. OVERALL WIDTH (ft) 110 1 00MIN. CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

86 865 7

LAND USE MULTI-FAMILY RESIDENTIAL, MIXED USE,COMMERCIAL





COMPOUND CURVE RADII (ft) 2/3R1 � R2 � R1 2/3R1 � R2 � R1



MINIMUM LANDING LENGTH (ft) 1 00 50RESTRICTIONS SUBJECT TO APPLICATION AND APPROVAL

BY FIRE DEPARTMENT


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. WHEN ROAD ACCESS TO STRUCTURES IS NOT REQUIRED FOR EMERGENCY VEHICLES.

DATE: JUNE 2009A-11

C/L P/L OREASEMENT

P/L OREASEMENT

ALTERNATEPARKWAY

(112/114' MIN)

STANDARDPARKWAY

(122'/124' MIN)

MIN.

2%

61'/63' MIN.

12' 16 26'/28'4 14'56/58'

26'/28'4MIN.

16'MIN

BUILDING

0'1OR7

2%

BUILDING

6" CURB & GUTTER (TIP)

ALT. 5' MIN SIDEWALK(TIP) PED. ACCESS7' WHEN CURB ADJACENT 3

37' MIN. SIDEWALK-1

6" MEDIAN CURB 8c GUTTER (TIP)

ANGLED MIN.PARKING


1,8%

MIN, MIN. ANGLEDPARKING


1' SAFETY

STRIP (TYP.)

1.8%

PRIVATE DRIVE-LOCAL COLLECTOR-W/ MEDIAN4W/ ANGLED PARKING

N.T.S.DESIGN DATA

ALTERNATESTANDARDMIN. OVERALL WIDTH (ft)MIN. CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

1 22 11298 985 7

MULTI-FAMILY RESIDENTIAL, MIXED USE,COMMERCIAL

LAND USE


DESIGN SPEED (mph)

MINIMUM C/L RADIUS (ft)

MIN. TANGENT REVERSING CURVE (ft)/MIN. TANGENT BROKEN BACK CURVES (ft)1

4,500 ADT(500)

STANDARD HILLSIDE

25 25

150 150

100 100

200 150

COMPOUND CURVE RADII (ft) 2/3 R1 � R2 � Ri 2/3 R1 -� R2 R

MAXIMUM GRADE 1 5%

MAXIMUM LANDING GRADE

MINIMUM LANDING LENGTH (ft)

3% 5%

1 00 50

1 0%

SUBJECT TO APPLICATION AND APPROVALBY FIRE DEPARTMENT


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4. WHEN ROAD ACCESS TO STRUCTURES IS REQUIRED FOR EMERGENCY VEHICLES:

26' FOR STRUCTURES <35' IN HEIGHT28' FOR STRUCTURES >35' IN HEIGHT

DATE: JUNE 2009

RESTRICTIONS

A-12

OPEN SPACEOR PARK VARIES EQ. EQ. 1 2'

MIN,

26' MIN.

RESIDENTIAL LOT

2/

_ 1 6' MIN. I _PARKING

2I I-

P/L OREASEMENT C/L

46' MIN.

P/L OREASEMENT

24' MIN. 22%

3 5' SIDEWALK 3

ALL-WEATHERSURFACE 6" CURB

MOUNTABLE CURB & & CUTTER

GUTTER OR ROLLEDCURB PER FIG. 15

DESIGN DATA

PRIVATE DRIVE-ONE WAYW/ PARALLEL PARKING ON ONE SIDE

N.T.S.


24 N/A5 N/A

LAND USE SINGLE FAMILY RESIDENTIAL, DETACHED CONDOMINIUMS,MULTI-FAMILY RESIDENTIAL<35', LOCAL MIXED USE, OPEN SPACE, PARK





COMPOUND CURVE RADII (ft) 2/3R1 � R2 � Ri 2/3R1 5 R2 � Fii



MINIMUM LANDING LENGTH (ft) 50 25

RESTRICTIONS NO SINGLE FAMILY DRIVEWAY ACCESSSUBJECT TO APPLICATION AND APPROVAL BY FIRE DEPARTMENT

1. ELIMINATE TANGENT IF MINIMUM TANGENT LENGTH CANNOT BE SATISFIED.2.ADT VOLUME ANALYSIS IS THE BASIS OF DESIGN AND SUPERCEDES UNITS

OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4.CROWN MAY BE ELIMINATED AT THE DISCRETION OF THE PROJECT ENGINEER.

DATE: JUNE 2009A-13

P/L OR P/L OREASEMENT c/L EASEMENT

138' MIN.

RESIDENTIAL LOT

-OPEN SPACEOR PARK VARIES EQ. EQ. 1 2'

MIN.

26' MIN.

2 20' MIN.

2% 2%1.8%

2

ALL—WEATHER 3

SURFACE ---5' SIDEWALK 3

6" CURB 8c GUTTERMOUNTABLE CURB &GUTTER OR ROLLEDCURB PER FIG. 15

DESIGN DATA

PRIVATE DRIVE-ONE WAYNO PARKING

N.T.S.


20 N/A5 N/A

LAND USE SINGLE FAMILY RESIDENTIAL DETACHED CONDOMINIUMS,

MUL11—FAMILY RESIDENTIAL65', LOCAL MIXED USE, OPEN SPACE, PARK




MIN. TANGENT REVERSING CURVE (ft) / 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) / 200 1 50

COMPOUND CURVE RADII (ft) 2/3 Ri � R2 � R 1 2/3 R1 � R2 � R 1MAXIMUM GRADE 1 0% 1 5%


MINIMUM LANDING LENGTH (ft) 50 25RESTRICTIONS NO SINGLE FAMILY DRIVEWAY ACCESS



DATE: JUNE 2009A-14

STANDARD ALTERNATE

SINGLE FAMILY RESIDENTIAL,DETACHED CONDOMINIUMS

LAND USE

STANDARD HILLSIDE

MAXIMUM GRADE 1 5%1 0%

NO EMERGENCY FIRE ACCESSREQUIRED

RESTRICTIONS

MIN. OVERALL WIDTH (ft)MIN. CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

201 6

N/A

N/AN/AN/A

ADT VOLUME (SF UNITS SERVED)2 450 ADT(50)

DESIGN SPEED (mph) 1 5 1 5


MIN. TANGENT REVERSING CURVE (ft)1MIN. TANGENT BROKEN BACK CURVES (ft)1

75N/A

N/A

75N/A

N/A

COMPOUND CURVE RADII (ft) 2/3R1 � R2 -� R1 2/3R15- R2 5-R1


MINIMUM LANDING LENGTH (ft)

3% 5%

25 25

LOT LINE

ES MT

2'

1 0' 1 0'

ES MT

2' VARIES O'' -4" 3

2'BUILDING OROBSTRUCTION

2% 2

GUTTER AS REQUIREDFOR DRAINAGE

DESIGN DATA

PRIVATE DRIVE-ALLEYNO FIRE ACCESS

N.T.S.


OR BUILDING AREA.3. HIKE VARIES DEPENDING UPON DRAINAGE REQUIREMENTS OF PROJECT.

DATE: JUNE 2009A-15

ROLLED CURB/ACCESS PERFIG. 15

ROLLED CURB/ACCESS PERFIG. 15

STANDARD ALTERNATE

SINGLE FAMILY RESIDENTIAL,DETACHED CONDOMINIUMS

LAND USE

STANDARD HILLSIDE

MAXIMUM GRADE 1 5%1 0%

MIN. OVERALL WIDTH (ft)MIN. CURB TO CURB WIDTH (ft)MIN. SIDEWALK WIDTH (ft)

2826N/A

N/AN/AN/A

ADT VOLUME (SF UNITS SERVED)2 650 ADT(75)

DESIGN SPEED (mph) 1 5 1 5


MIN. TANGENT REVERSING CURVE (ft)1MIN. TANGENT BROKEN BACK CURVES (ft)1

75N/AN/A

75N/A

N/A

COMPOUND CURVE RADII (ft) /3R1 � R2 � R1 /3R1-C R2 5-R1


MINIMUM LANDING LENGTH (ft)1RESTRICTIONS

3% 5%

25 25

C/LI-LI I

I 28' MIN.I LL/

I 26' ILJ I LIJ

1-1-1C-r)'‹ It-A-1

1 3 13' Lcin-J

I

5'11)1IN 5 I MIN rI 2' --

MIN I MIN II _OLL-I

ESMT1LL,cc I

I ESMT1Ic

— FLOWLINE1.8%

Awle

PRIVATE DRIVE-ALLEYN. 1.5.

DESIGN DATA


OR BUILDING AREA.

DATE: JUNE 2009A-16

84' MIN.42' 42'

P/L OR P/L OREASEMENT EASEMENT

10' 32' 32' 10'

6' SIDEWALK (TYP)3 " CURB & GUTTER (TYP) 6' SIDEWALK (MT)3

INDUSTRIAL / COMMERCIAL LOOPPRIVATE DRIVE

MTS,

DESIGN DATA


64 N/A6 N/A

LAND USE COMMERCIAL / INDUSTRIAL

BLDG AREA (sf) SERVED (ADT VOLUME) 1,400,000 sf (10,000 ADT)

STANDARD—

HILLSIDEDESIGN SPEED (mph) 404 404

MINIMUM C/L RADIUS (ft) 5004 5004

MIN. TANGENT REVERSING CURVE (ft) 1 1 00 1 00MIN. TANGENT BROKEN BACK CURVES (ft) 1 200 200

COMPOUND CURVE RADII (ft) 2/3R15- R2 �.. Ri 3/3R1 � R2 5- RiMAXIMUM GRADE 1 0% 1 0%


MINIMUM LANDING LENGTH (ft) 1 00' 50'

RESTRICTIONS


OR BUILDING AREA.3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.4.A MINIMUM RADIUS OF 100' CAN BE UTILIZED IF CARRYING 1000 ADT

OR LESS, WITH A 15 MPH DESIGN SPEED.

DATE: JUNE 2009A-17

2%

N.) ,3 % MAX

GRADE

2'MIN.

SECTION A-A (MIN R/W = 90')NO PARKING

NCURB R/w

GUARDSHACK

6" CURB & GUTTER (TIP)L 5' MIN SIDEWALK (TIP)(WHERE REQUIRED) 3

-2

Cr\_ 5

z (-^4//v. 1

111111ftrati4? 41?0(//vo

rn0N.)

1,3

1.8%

6" MEDIAN CURB & GUTTER (TYP)

50' MIN

CURB R/W

1.8%

PAEASEMENT

OR P/LC/IL EASEMENT

90' MIN.

OR

45' MIN. 45' MIN.

VAR 20' 20' 13' 11' 20' VAR.3' MIN

'4MIN.

(EXIT)MIN MIN.

(ENTRY)MIN MIN.

(ENTRY)3' MIN

.4

2'MIN.

2%


TYPICAL GATE DETAILWITH GUARD SHACK

N.T.S.NOTES:

1.DIMENSIONS SHOWN HEREON ARE MINIMUM REQUIREMENTSAND SUBJECT TO CHANGE. FINAL DIMENSIONS WILL BE BASED UPONTRAFFIC ENGINEER'S AND FIRE DEPARTMENT RECOMMENDATIONS.

2. PUBLIC WORKS TO DETERMINE MINIMUM KEYPAD SET-BACKBASED ON THE TRAFFIC STUDY,

3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.BASED ON THE TRAFFIC STUDY

4. PARKWAY CAN BE REDUCED TO 3' MIN. WHEN SIDEWALK IS NOT REQUIRED.

5. CORNER CUT-OFF IN P/L REQUIRED WHEN ADJACENT TO PUBLIC STREET.

DATE: JUNE 2009

A-18

20'

P/LEASEMENT

OR C/L

70' MIN.

P/LEASEMENT

OR

35' MIN. 35' MINVAR. 26' 1 24' VAR.

3' MINI

2'

MIN.(EXIT)

1 . 8%

MIN.(ENTRY)

1 . 8%

3 MIN 4

2'MIN

2%

MIN.

2%

6" CURB & GUTTER (NP) \ 6 MEDIAN CURB & GUTTER (PP)5' MINSIDEWALK (TYP) 3(WHERE REQUIRED) SECTION A-A (MIN R/W = 70')

NO PARKINGN.T.S.

GATE


MIN.

1 4'

\ \CONTROL \BOX

wlpeic2r

NY?

24' VAR.3 MIN.

5

PRIVATE DRIVE OR PUBLIC STREET

TYPICAL GATE DETAIL WITHOUT GUARD SHACKN.T.S.

NOTES:

1 . DIMENSIONS SHOWN HEREON ARE MINIMUM REQUIREMENTSAND SUBJECT TO CHANGE, FINAL DIMENSIONS WILL BE BASED UPONTRAFFIC ENGINEER'S AND FIRE DEPARTMENT RECOMMENDATIONS.

2. PUBLIC WORKS TO DETERMINE MINIMUM KEYPAD SET—BACKBASED ON THE TRAFFIC STUDY.

3. BASE MAY BE REQUIRED PER SOILS ENGINEER'S RECOMMENDATIONS.BASED ON THE TRAFFIC STUDY

4. PARKWAY CAN BE REDUCED TO 3' MIN. WHEN SIDEWALK IS NOT REQUIRED.

5. CORNER CUT—OFF IN P/L REQUIRED WHEN ADJACENT TO PUBLIC STREET.

DATE: JUNE 2009

CURB

A-19

20'

10'RMIN

RADIUS DETAIL

VARIES

ECR■-)0

cy

ECR

3

10' MIN.

I LOCAL STREET1

c.,cz),

TYPICAL PRIVATE DRIVE LOCAL INTERSECTION 3—WAY TRAFFIC CALMING DETAIL

N. IS.

1. REDUCTION IN WIDTH ALLOWED WITH THE APPROVAL OF LACDPW AND LACED.34' MINIMUM WIDTH.

DATE: JUNE 2009A-20

20'

Ebb-1 0 'RMIN.

RADIUS DETAIL

11

1

,N _1 c '` .

1 -,,) STREET'I

cc 1c.)QI, I (

et

N'■-.----

-7-1-

i.z---------0

1.

MID BLOCK TRAFFIC CALMING DETAIL

N. T. S.

DATE: JUNE 2009

A — 2 1

10'

EDGE OF GUTTER

20'

"TYPICAL STREET LIGHT AND TREE PLANTER DETAIL

STREET LIGHT SPACINGVARIES PER PLAN

V N41

reg

LEGEND:

PROPOSED TREE LAYOUT PROPOSED DRIVEWAY LAYOUT

* PROPOSED STREET LIGHT PROPOSED PARKING AREA

TYPICAL HORIZONTAL GEOMETRY

PRIVATE DRIVE - RURAL

DATE: JUNE 2009A-22

6" CF.

MAINTAIN GUTTER GRADE

NON—OBSTRUCTIVE CURB SECTION

R=1/2"

VARIES

CONCRETE CURB TRANSITIONN.T.S.

2" a= 1 2" —18"II

b =

CONCRETE ROLLED CURB N. T.

DATE: JUNE 2009

A-23

public works,dpw.lacounty.gov/ldd/publications/private drives and traffic...pavement design ......

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