hsm practitioner’s guider for two-lane rural highways workshop exercise iv – us 52 from...
TRANSCRIPT
HSM Practitioner’s Guider for Two-Lane Rural Highways Workshop
Exercise IV – US 52 from Sageville to Holy Cross – Group Exercise
- Session #8
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Exercise IV: US 52 from Sageville to Holy Cross
Learning Outcomes:► Compute combined predicted safety performance of x-section, grade, curvature, and intersections
►Compare predicted safety performance to actual safety performance
► Identify greatest safety shortfall
► Identify priorities for improvement
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1996 - 2000
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Exercise IV: US 52 from Sageville to Holy Cross – Segments/Grade/Curves
LOCATION NUMBER
On Roadway Segments
63
Within Intersection 16
Intersection Related 1
On-Grades 3
On Curves 39
Total 122
Crashes by
location
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Exercise I – US 52 from Sageville to Holy Cross
Length: 13.0 miles AADT: 2,500 Lane Width: 11 feet Shoulders:
Paved 0 feetGravel 4 feet
Hazard Rating: 5 Driveways: 91 on level tangent segmentsTotal Length of Curves = 4,826 ft or 0.914 mi Total Length of Grades = 13,400 ft or 2.54 mi
Geometric Information:
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Exercise I – US 52 from Sageville to Holy CrossGeometric Information Grades:
Grade Section # % Grade Length in ft
1 5.6% 200
2 3.95 450
3 3.875 300
4 6 3200
5 5.2 450
6 5.2 450
7 5 700
8 5.4 350
9 3.05 400
10 5 900
11 5.9 1950
12 5 1700
13 6 1050
14 3.9 1150
15 4.8 150
Total Length = 13,400 feet or 2.54 miles
3%< All Grades <6%
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Exercise II: US 52 from Sageville to Holy Cross
Geometric Information Curves:
Curve # Delta Degree Radius Length
1 104 deg 8 deg 50’ 670.15 ft 1,225.5 ft
2- “A” 104 deg 33’ 9 deg 836.6 ft 1162 ft
3- “B” 63 deg 56’ 12 deg 477.5 ft 532.8 ft
4- “C” 67 deg 04’ 12 deg 477.5 ft 558.9 ft
5- “D” 42 deg 15’ 12 deg 477.5 ft 352 ft
6- “E” 62 deg 58’ 12 deg 477.5 ft 524.8 ft
7- “F” 28 deg 10’ 6 deg 955 ft 469.4 ft
Total Length = 4,826 feet8-8
Exercise III – US 52 from Sageville to Holy Cross
Intersections on US 52: (AADTmaj = 2500)
Station Location Type Side Road ADT
Predicted Crashes
Skew Crashes x CMF
107 East of D T 450 15 deg
126 West of D T 250 5 deg
262 East of F T 450 70 deg
559 F + 300 0 deg
TOTAL ?
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Exercise IV: US 52 from Sageville to Holy Cross
1. Compute the combined predicted safety performance (x-section + curves + intersections) and compare to actual safety record
2. Identify priorities areas for improvements
Discussion
Use Worksheet Exercise IV
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Exercise IV – US 52 from Sageville to Holy Cross
From the US 52 corridor crash information, perform the following tasks:
2. Compute the combined predicted crash frequency performance (x-section + curves + intersections) and compare to actual crash record- Where is the greatest safety shortfall?
a. Lane and Shoulder Widthb. Driveway Densityc. Roadside Designd. Curvese. Intersections
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From the US 52 corridor crash information, perform the following tasks:2. Identify priorities as to improvements
- where is the greatest shortfall (at 2,500 AADT)?
a. Lane and Shoulder Width (yes/no) (___%)
c. Roadside Design (yes/no) (____%)
d. Curves (yes/no) (___%)
e. Intersections (yes/no) (___%)
b. Driveway Density (yes/no) (___%)
Exercise IV – US 52 from Sageville to Holy Cross
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Learning Outcomes:
► Computed combined predicted safety performance of x-section, grade, curvature, and intersections
►Compared predicted safety performance to actual safety performance
► Identified greatest safety shortfall
► Identified priorities for improvement
Exercise IV – US 52 from Sageville to Holy Cross
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Safety Effects Calculations Rural Two-Lane Roads
CONCERNS:
GOOD NEWS:
Too Time Consuming for Calculations and Organizing Results?
Excel spreadsheet facilitates calculations and delivers results in an organized format!
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Questions and Discussion
HSM Practitioner’s Guider for Two-Lane Rural Highways Workshop
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