HSM Practitioner’s Guider for Two-Lane Rural Highways Workshop Exercise IV – US 52 from Sageville to Holy Cross – Group Exercise - Session #8 8-1

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 8-2

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Exercise IV: US 52 from Sageville to Holy Cross – Segments/Grade/Curves LOCATIONNUMBER On Roadway Segments 63 Within Intersection16 Intersection Related1 On-Grades3 On Curves39 Total122 Crashes by location 8-5

Exercise I – US 52 from Sageville to Holy Cross  Length: 13.0 miles  AADT: 2,500  Lane Width: 11 feet  Shoulders: Paved 0 feet Gravel 4 feet  Hazard Rating: 5  Driveways: 91 on level tangent segments  Total Length of Curves = 4,826 ft or mi  Total Length of Grades = 13,400 ft or 2.54 mi Geometric Information: 8-6

Exercise I – US 52 from Sageville to Holy Cross Geometric Information Grades: Grade Section #% GradeLength in ft 15.6% Total Length = 13,400 feet or 2.54 miles 3%< All Grades <6% 8-7

Exercise II: US 52 from Sageville to Holy Cross Geometric Information Curves: Curve #DeltaDegreeRadiusLength deg8 deg 50’ ft1,225.5 ft 2- “A” 104 deg 33’9 deg836.6 ft1162 ft 3- “B” 63 deg 56’12 deg477.5 ft532.8 ft 4- “C” 67 deg 04’12 deg477.5 ft558.9 ft 5- “D” 42 deg 15’12 deg477.5 ft352 ft 6- “E” 62 deg 58’12 deg477.5 ft524.8 ft 7- “F” 28 deg 10’6 deg955 ft469.4 ft Total Length = 4,826 feet 8-8

Exercise III – US 52 from Sageville to Holy Cross Intersections on US 52: (AADT maj = 2500) StationLocationTypeSide Road ADT Predicted Crashes SkewCrashes x CMF 107East of DT45015 deg 126West of DT2505 deg 262East of FT45070 deg 559F+3000 deg TOTAL ? 8-9

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 8-10

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 Width b. Driveway Density c. Roadside Design d. Curves e. Intersections 8-11

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 8-12

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 8-13

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! 8-14

Questions and Discussion HSM Practitioner’s Guider for Two-Lane Rural Highways Workshop 8-15