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KENTUCKY TRANSPORTATION CENTER
GUIDELINES FOR ROAD DIET CONVERSIONS
Research ReportKTC-11-19/SPR415-11-1F
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GUIDELINES FOR ROAD DIET CONVERSIONS
Draft Final Report
1. Report Number KTC-11-XX / SPR-415-11-1F
2. Government Accession No. 3. Recipient’s Catalog No.
4. Title and Subtitle Guidelines for Road Diet Conversions
5. Report Date November 2011
6. Performing Organization Code
7. Author(s) N. Stamatiadis, A. Kirk, C. Wang, and A. Cull
8. Performing Organization Report No. KTC-11-XX / SPR-415-11-1F
9. Performing Organization Name and Address Kentucky Transportation Center College of Engineering University of Kentucky Lexington, Kentucky 40506-0281
10. Work Unit No.
11. Contract or Grant No. SPR316
12. Sponsoring Agency Name and Address Kentucky Transportation Cabinet 200 Mero Street Frankfort, KY
13. Type of Report and Period Covered: Final Report; 07/10 – 12/11
Fi l14. Sponsoring Agency Code
15. Supplementary Notes
16. Abstract
17. Key Words Intersection Design, Roundabout, Inside left-turn, median u-turn, superstreet, continuous flow, jughandle, bowtie, intersection evaluation
18. Distribution Statement Unlimited
19. Security Classification (report) Security Classification (this page)
21. No. of Pg: 94 22. Price $0
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
TABLE OF CONTENTS
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LIST OF FIGURES
LIST OF TABLES
EXECUTIVE SUMMARY
INTRODUCTION
LITERATURE REVIEW
METHODOLOGY
RESULTS
Signalized Intersections
negativelower
negativeshorter
Unsignalized Intersections
negative lower
Operations Models
Signalized Intersection Safety
Unsignalized Intersection Safety
Safety Models
Summary
CASE STUDIES
US 27 Campbell County
Euclid Ave. Fayette County
KY 1428 Floyd County
US 172 Mercer County
US 60 Woodford County
Summary
GUIDELINES
Road Diet Conversions
CONCLUSIONS AND SUMMARY
REFERENCES
Road Diets: Fixing the Big Roads
Evaluation of Lane Reduction “Road Diet” Measures and Their Effects of Crashes and Injuries
Evaluation of Lane Reduction Road Diet Measures on Crashes
Manual on Uniform Traffic Control Devices
Paper No. 07-1918
Transportation Research Record 2165
Surrogate Safety Assessment Model and Validation: Final Report,
Transportation Research Record 1784
) Guidelines for the Conversion of Urban Four-Lane Undivided Roadways to Three-Lane Two-Way Left-Turn Lane Facilities Final Report
Transportation Research Record 644
Journal of the Transportation Research Board No. 1953
Road Diet handbook: Setting Trends for Livable Communities
Proceedings 3rd International Symposium on Highway Geometric Design
Highway Capacity Manual
Transportation Research Board Urban Street Symposium
APPENDIX A
ROAD DIET CASE STUDY EVALUATION US 60 VERSAILLES, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
INTRODUCTION
Figure 1
Figure 1: Study Area
ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Sections
Figure 3Figure 4.
Figure 3: Road Diet Cross-Section
Figure 4: US 60 with Standard Road Diet
Figure 5.
Figure 5: US 60 with Added Shoulders
Figure 6 Figure 7
Figure 6: US 60 with Parking
Figure 7: US 60 Road Diet Types and Locations
RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
Table 2: Pre- Road Diet Three-Year Crash Summary (2005-2007)
Total 39 15 24
Table 3: Post- Road Diet Three-Year Crash Summary (2009-2010)
Total 49 16 33
EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
ROAD DIET CASE STUDY EVALUATION EUCLID AVE. LEXINGTON, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
INTRODUCTION
Figure 1
Figure 1: Study Area
ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Section
Figure 3
Figure 3: Road Diet Cross-Section
Figure 4.
Figure 4: Euclid Post-Road Diet Transformation
RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
Table 2: Pre- Road Diet Three-Year Crash Summary (1997-1999)
Total 236 140 96
Table 3: Post- Road Diet Three-Year Crash Summary (2001-2003)
Total 104 49 55
EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
ROAD DIET CASE STUDY EVALUATION US 27 CAMPBELL COUNTY, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
INTRODUCTION
Figure 1
Figure 1: Study Area
ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Section
Figure3
Figure 3: Road Diet Cross-Section
Figures 4 5.
Figure 4: US 27 Post-Road Diet Transformation (Near Ends with More Entrances)
Figure 5: US 27 Post-Road Diet Transformation (In Middle with Few Entrances)
RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
Table 2: Pre- Road Diet Three-Year Crash Summary (2005-2007)
Total 60 15 47
Table 3: Post- Road Diet Three-Year Crash Summary (2009-2010)
Total 19 1 18
EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
ROAD DIET CASE STUDY EVALUATION KY 1428 FLOYD COUNTY, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
INTRODUCTION
Figure 1
Figure 1: Study Area
ROAD DIET IMPLEMENTATION
Figure 2 and Figure 3.
Figure 2: Initial Four Lane Section (North of KY 114)
Figure 3: Initial Two Lane Section (South of KY 114)
Figure 4 Figure 5
Figure 4: Road Diet Cross-Section (North of 114)
Figure 5: Road Diet Cross-Section (South of 114)
Figures 6 Figure 7.
Figure 6: KY 1428 Post-Road Diet Transformation
Figure 7: KY 1428 Post-Road Diet Transformation (Transition from Two Lanes)
RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
Table 2: Pre- Road Diet Three-Year Crash Summary (2002-2004)
Total 115 17 98
Table 3: Post- Road Diet Three-Year Crash Summary (2007-2009)
Total 52 12 40
EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
ROAD DIET CASE STUDY EVALUATION US 127 HARRODSBURG, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
INTRODUCTION
Figure 1
Figure 1: Study Area
ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Section
Figure3
Figure 3: Road Diet Cross-Section
Figure 4.
Figure 4: US 127 Post-Road Diet Transformation
RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
Table 2: Pre- Road Diet Three-Year Crash Summary (2003-2005)
Total 164 89 75
Table 3: Post- Road Diet Three-Year Crash Summary (2007-2009)
Total 97 36 61
EVALUATION METHODOLOGY
Safety Evaluation
Tables 2 3
Operations Evaluation
EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
ROAD DIET CASE STUDY EVALUATION KY 74 MIDDLESBORO, KY
KYTC DISTRICT 11 FINAL REPORT
Prepared by
Prepared for:
Date:
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
INTRODUCTION
Figure 1
Figure 1: Study Area
EXISTING CONDITIONS
Figure 2
Figure 2: Typical Section
Appendix A
Traffic Volumes
Appendix B
Appendix B.
Travel Times
Table 1
Table 1: Travel Time Study
Westbound
Total 48 47 43Eastbound
Total 51 49 52
Crash History
Table 2
Table 2: Three-Year Crash Summary (2007-2009)
Total 135 100 35
Appendix C
ROAD DIET ALTERNATIVE
Figure 3
Figure 3: Typical Cross-Section
EVALUATION METHODOLOGY
Calibration
Table 3
Table 3: VISSIM Travel Time Calibration
Westbound
Total 48 47 47 49 43 54Eastbound
Total 51 50 49 51 52 59
Measures of Effectiveness
RESULTS
Operational Analysis Table 4
Table 4: Travel Time Corridor Level
Travel Segment (KY 74)
Travel Time(sec)AM Noon PM
4-Lane 3-Lane 4-Lane 3-Lane 4-Lane 3-LaneWestbound
Total 47 41 49 40 54 49Eastbound
Total 50 50 51 50 59 54
Table 5
Table 5: PM Peak Hour Intersection Operations Summary
Safety Analysis
Table 6
Table 6: Safety Effects of Road Diet
Total 27 - 11 -
DESIGN CONSIDERATIONS
Figure 4
EVALUATION SUMMARY
Table 7
Table 7: Summary of Road Diet Installation Effects
APPENDIX A Existing Conditions
APPENDIX B Traffic Volumes
6
ING
ITE
CODE
210
CODE
934
E ST
ORE
ITE
CODE
935
22nd
20 th
21st Street
33, 1
6, 2
5
6
45
4
22
15
45
3
8
20
47
6
10
14, 2
, 2
3, 8
, 4
31, 9
, 18
6, 1
541
553
506
506
50
482
470
476
476
4
4
4
10
10
4
4
10
10
44
50
0
9
6FITZPATRICK
4
45
2
50
3
46
5
3
20
50
1
135
6, 3
9, 5
27, 2
6, 2
7
2, 1
, 7
3, 3
, 183
506
471
471
655
485
506
506
656
19 th
18 th
4
10
10 10
10
4
6
120
52
1
38
30
56
3
15
49, 7
, 13
18, 9
, 17
679
551
15 th
4
10
4
22nd
20 th
21st Street
4
4
10
10
4
4
10
10
29, 1
8, 4
2
8
47
4
38
43
44
0
13
24
46
0
30
42
42
9
18
40, 1
9, 2
3
8, 1
0, 2
6
69, 2
4, 4
8
11, 3
49
6 48
9 48
9
520
500
508
514
5
FITZPATRICK
19 th
18 th
4
10
10 10
10
4
14
43
0
58
4
49
4
10
28
49
1
148
18, 6
4, 4
93, 6
9, 6
9
9, 4
, 27
2, 1
4, 1
85
505
508
508
706
541
502
502
667
15 th
4
0
4 11
8
562
50
30
50
2
15
110,
10,
34
31, 2
3, 1
9
730
615
54
7
22nd
20 th
21st Street
9
9
5
5
9
9
5
5
0
55, 3
4, 1
5
26
59
7
55
33
65
9
26
30
71
7
48
13, 1
1, 3
0
14, 1
0, 4
0
71, 3
0, 6
0
10, 3
77
1 79
5 79
5 81
678
686
7
34
72
5
12
FITZPATRICK
19 th
18 th
9
5
5 5
5
9
85
60
6
12
242
56
0
20
7
68
7
3
7, 6
9, 1
2
99, 8
2, 8
1
6, 4
, 33
10, 1
0, 3
26
822
919
712
703
703
697
15 th
9 12
5
768
10
55
61
2
27
45, 2
8, 4
5
56, 1
7, 2
7
903
840
APPENDIX C Crash Diagrams
APPENDIX B
INTRODUCTION
ROAD DIET CONVERSIONS
Process
Operational evaluation
Safety evaluation
Operational Performance
Safety Performance
Other Considerations
Design Considerations
Performance Evaluation
When Not to Convert
Analysis Checklist
Operational aspects
Safety aspects
Multimodal operations
Access managementLivabilityOperational consistencyTransition designCross section elements
REFERNCES
Guidelines for Road Diet Conversions,
2.
For more information or a complete publication list, contact us at:
176 Raymond BuildingUniversity of Kentucky
Lexington, Kentucky 40506-0281
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1-800-432-0719www.ktc.uky.edu
KENTUCKY TRANSPORTATION CENTER
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