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Results and Status of State Crash Analyses

IDS - Pool Fund. Results and Status of State Crash Analyses. Presented to IDS Pool Fund Partners April 20, 2005. Page 2. Agenda. Status Report State Summaries Minnesota Wisconsin North Carolina Progress on Iowa Michigan Georgia. Page 3. Status Report. Crash Data Analysis.

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Results and Status of State Crash Analyses

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  1. IDS - Pool Fund Results and Status of State Crash Analyses Presented to IDS Pool Fund Partners April 20, 2005

  2. Page 2 Agenda • Status Report • State Summaries • Minnesota • Wisconsin • North Carolina • Progress on • Iowa • Michigan • Georgia

  3. Page 3 Status Report Crash Data Analysis Coordination Field Review Report Minnesota Georgia Iowa Michigan Nevada New Hampshire North Carolina Wisconsin Expressway Two-Lane Expressway Two-Lane Two-Lane Two-Lane Expressway Expressway

  4. Page 4 Minnesota Process • Census of all rural, expressway, thru-STOP intersections • Identified 23 intersections with the a crash rate greater than the critical crash rate. • Screened down to the 3 intersections with the high crash frequency, crash severity, and percentage of right angle crashes

  5. Page 5 Minnesota –US 52 & CSAH 9 CSAH 9 U.S. 52

  6. Page 6 Minnesota –US 52 & CSAH 9 • Intersections has a high percentage of right angle crashes (65%). • 33% of at-fault drivers in crossing path crashes are over the age of 64. • US 52 corridor from Inver Grove Heights to Rochester has nearly one-quarter of rural expressway, thru-STOP intersections over the critical crash rate. NB SB

  7. Page 7 Minnesota –US 52 & CSAH 9

  8. Page 8 Wisconsin • DOT Selected Corridor With Known Crash Problem • US 53 from Rice Lake to Superior (~ 70 miles) • Mainline volumes range from 4,700 to 11,000 vpd • 74 intersections had at least one crash in 6.5 year period (Jan. 1, 1999 to June 30, 2004) • 6 intersections were identified as candidates for deployment due to significant crash problems

  9. Page 9 Wisconsin – US 53 & STH 77 Horizontal Curve Median Design Approach Design

  10. Page 10 Wisconsin – US 53 & STH 77

  11. Page 11 3 4 5 1 2 North Carolina Highlights • DOT Selected Intersections from Highway Safety Improvement Program • The intent of HSIP is to “identify locations that exceed minimum warranting criteria developed by safety engineers for particular crash types and patterns for further analysis and investigation.” • HSIP criteria used were I-1 (minimum number of frontal impact crashes) and I-5 (chronic crash pattern) • Intersections were also thru-STOP, and the major roadway was a four-lane divided highway with a speed limit > 55 mph • 59 of the top 300 HSIP intersections met the criteria, but only 12 had no safety countermeasures in place 1) US 74 and SR 2210 2) US 74 and SR 1574 3) NC 87 and SR 1150 4) NC 87 and SR 1700 5) US 74 and SR 1152

  12. Page 12 North Carolina –US 74 and SR 2210 Mainline Approaches had no Horizontal and Vertical Curves Approach Design Median Design

  13. Page 13 North Carolina –US 74 and SR 2210

  14. Page 14 Iowa Process • Census of all rural, expressway, thru-STOP intersections • Selected the 20 intersections with the greatest difference between the actual crash severity index rate and the expected crash severity index rate • From list of 20, screened down to the 6 intersections with the most failure to yield crashes

  15. Page 15 Typical Candidate Intersection Intersections generally have similar approach design. EB Approach at US 218 & CR G-36 SB Approach at US 151 & CR X-20

  16. Page 16 Typical Candidate Intersections Several different median designs are in place. STOP sign at US 218 & CR C-57 Narrow median at US 61 & Hershey Rd. YIELD sign at US 151 & CR X-20

  17. Page 17 Typical Candidate Intersections Intersection often on/near horizontal or vertical curve. East Approach at US 151 & CR X-20 North Approach at US 61 & Hershey Road

  18. Page 18 Unique Features Offset right turn lane (US 61 & Hershey Road) Splitter Island (IA 163 & NE 70th Street)

  19. Page 19 Iowa Crash Summary

  20. Page 20 Iowa Crash Summary

  21. Page 21 Michigan Process • MDOT identified 37 intersections around the Lansing area with the following characteristics: • Rural, unsignalized intersection • 3 or more angle crashes in 2001 to 2003 • Thru (major) street has a posted speed limit that is > 55 mph • 22 intersections were screened out based on the following: • 4 were signalized • 2 had incomplete or missing crash data • 16 had low crash frequency, low frequency of angle crashes, & low crash severity • Of the remaining 15 intersections • Collected ADT and basic geometric information • Computed crash rate and critical crash rate

  22. Page 22 Michigan Crash Summary

  23. Page 23 Georgia Process • Census of all intersections that are: • Two-lane State route intersecting two-lane State route • Rural • Unsignalized • Selected all intersections with 20+ crashes • Collected ADT • Computed crash rate and critical crash rate • 19 potential candidate intersections

  24. Page 24 Conclusions • Similar crash patterns have been found at rural intersections in Minnesota, Wisconsin, North Carolina, and Iowa • Similar crash rates, high severity, straight crossing path, farside location, gap related predominate • Many intersections have a high involvement of older drivers • Weather and light conditions play minimal role in intersection safety problems • At the few intersections with a significantly higher than expected crash rate, the Pie is not only larger, it is sliced differently. The minor street major crossing maneuver is the most hazardous.

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