HSM Practitioner’s Guider for Two-Lane Rural Highways Workshop HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 Exercise IV – US 52 from Sageville to Holy Cross – Group Exercise - Session #8 Session #8 – Exercise IV – US 52 in Iowa (west of DuBuque and the Mississippi River) – Group exercise for all issues Session 8 – Exercise IV – Group Exercise

Exercise IV: US 52 from Sageville to Holy Cross HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 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 Learning Objectives for Session #8 – Exercise IV – Overall Group Exercise Session 8 – Exercise IV – Group Exercise

HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 Session 8 – Exercise IV – Group Exercise

HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 1996 - 2000 Session 8 – Exercise IV – Group Exercise

HSM Practicitioner's Guide for Two-Lane Rural Highways Workshop Exercise IV: US 52 from Sageville to Holy Cross – Segments/Grade/Curves August 2010 LOCATION NUMBER On Roadway Segments 63 Within Intersection 16 Intersection Related 1 On-Grades 3 On Curves 39 Total 122 Crashes by location Session 2 – Exercise I

HSM Practitioner's Guide for Two-Lane Rural Highways Workshop Exercise I – US 52 from Sageville to Holy Cross August 2010 Geometric Information: 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 0.914 mi Total Length of Grades = 13,400 ft or 2.54 mi US 52 Geometric Plan information Session 8 – Exercise IV – Group Exercise

HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 Exercise I – US 52 from Sageville to Holy Cross Grade Section # % Grade Length in ft 1 5.6% 200 2 3.95 450 3 3.875 300 4 6 3200 5 5.2 7 700 8 5.4 350 9 3.05 400 10 900 11 5.9 1950 12 1700 13 1050 14 3.9 1150 15 4.8 150 Geometric Information Grades: Total Length = 13,400 feet or 2.54 miles US 52 Geometric Plan information 3%< All Grades <6% Session 8 – Exercise IV – Group Exercise

HSM Practitioner's Guide for Two-Lane Rural Highways Workshop Exercise II: US 52 from Sageville to Holy Cross August 2010 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’ 558.9 ft 5- “D” 42 deg 15’ 352 ft 6- “E” 62 deg 58’ 524.8 ft 7- “F” 28 deg 10’ 6 deg 955 ft 469.4 ft US 52 Geometric Plan information Total Length = 4,826 feet Session 8 – Exercise IV – Group Exercise

Exercise III – US 52 from Sageville to Holy Cross HSM Practitioner's Guide for Two-Lane Rural Highways Workshop Exercise III – US 52 from Sageville to Holy Cross August 2010 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 250 5 deg 262 East of F 70 deg 559 F + 300 0 deg TOTAL ? Session 8 – Exercise IV – Group Exercise

Exercise IV: US 52 from Sageville to Holy Cross HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 Compute the combined predicted safety performance (x-section + curves + intersections) and compare to actual safety record Identify priorities areas for improvements Discussion Pause at this slide; continue on when participants have worked on the exercise. Use Worksheet Exercise IV Session 8 – Exercise IV – Group Exercise

Exercise IV – US 52 from Sageville to Holy Cross HSM Practitioner's Guide for Two-Lane Rural Highways Workshop Exercise IV – US 52 from Sageville to Holy Cross August 2010 From the US 52 corridor crash information, perform the following tasks: 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 Session 8 – Exercise IV – Group Exercise

Exercise IV – US 52 from Sageville to Holy Cross HSM Practitioner's Guide for Two-Lane Rural Highways Workshop Exercise IV – US 52 from Sageville to Holy Cross August 2010 From the US 52 corridor crash information, perform the following tasks: Identify priorities as to improvements - where is the greatest shortfall (at 2,500 AADT)? a. Lane and Shoulder Width (yes/no) (___%) b. Driveway Density (yes/no) (___%) c. Roadside Design (yes/no) (____%) d. Curves (yes/no) (___%) e. Intersections (yes/no) (___%) Session 8 – Exercise IV – Group Exercise

HSM Practitioner's Guide for Two-Lane Rural Highways Workshop Exercise IV – US 52 from Sageville to Holy Cross August 2010 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 Learning Objectives for Session #8 – Exercise IV – Overall Group Exercise Session 8 – Exercise IV – Group Exercise

Safety Effects Calculations Rural Two-Lane Roads HSM Practitioner's Guide for Two-Lane Rural Highways Workshop August 2010 Safety Effects Calculations Rural Two-Lane Roads Too Time Consuming for Calculations and Organizing Results? CONCERNS: Excel spreadsheet facilitates calculations and delivers results in an organized format! GOOD NEWS: Cover slide showing title, event title, location and date: ‘Overview of the New HSM’ Session 8 – Exercise IV – Group Exercise 14

Questions and Discussion HSM Practitioner’s Guider for Two-Lane Rural Highways Workshop Safety and Operational Effects of Geometric Design Features for Two-Lane Rural Highways Workshop May 2009 Questions and Discussion Session 7 – Exercise III - Intersections