1. 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

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

3. Status Report Minnesota Georgia Iowa Michigan Nevada New Hampshire
Page 3
Status Report
Coordination
Crash Data Analysis
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. Minnesota – US 52 & CSAH 9 NB SB Page 6
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. Wisconsin DOT Selected Corridor With Known Crash Problem
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. Wisconsin – US 53 & STH 77 Horizontal Curve Median Design
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Wisconsin – US 53 & STH 77
Horizontal Curve
Median Design
Approach Design

10. Page 10
Wisconsin – US 53 & STH 77

11. North Carolina Highlights
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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 5 4 3 1 2
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. North Carolina – US 74 and SR 2210
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North Carolina – US 74 and SR 2210
Mainline Approaches had no Horizontal and Vertical Curves
Approach Design
Median Design

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

14. Iowa Process Census of all rural, expressway, thru-STOP intersections
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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. Typical Candidate Intersection
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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. Typical Candidate Intersections
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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. Typical Candidate Intersections
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. Unique Features Offset right turn lane (US 61 & Hershey Road)
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Unique Features
Offset right turn lane (US 61 & Hershey Road)
Splitter Island (IA 163 & NE 70th Street)

19. US 61 & Hershey Road (Muscatine)
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Iowa Crash Summary
Performance Measure
US 61 & Hershey Road (Muscatine)
US 18 & US 71 (Clay)
US 151 & CR X-20 (Linn)
IA 163 & NE 70th Street (Polk)
US 218 & CR G-36 (Washington)
US 218 & CR C-57 (Black Hawk)
Crash Frequency 13 15 11 14
Crash Severity Fat
Major Inj
Minor Inj
Possible Inj PD
2 (15%)
5 (38%)
1 (7%)
0 (0%)
3 (20%)
4 (27%)
7 (47%)
2 (18%)
4 (36%)
5 (45%)
7 (50%)
3 (21%)
4 (31%)
2 (13%)
Daily Entering ADT
13,310
11,710
8,830
16,050
13,670
20,060
Crash Rate
0.9
1.2
1.1
0.8
0.7
Expected Rate
0.4 (MN)
Critical Crash Rate
1.0
Correctable Crash Type
11 (85%)
12 (80%)
11 (79%)
9 (69%)
11 (73%)
1 (9%)
1 (8%)
3 (25%)
7 (58%)
2 (40%)
1 (20%)
6 (55%)
1 (11%)
2 (22%)
4 (44%)
At-Fault Driver
< 21
21 – 64
> 64
7 (64%)
9 (75%)
2 (17%)
8 (89%)
3 (27%)
Crash Location
Farside
Nearside
Unknown
4 (80%)
Contributing Factors
Int Recg
Gap Recg
8 (73%)
8 (67%)
5 (100%)
9 (82%)
7 (78%)
11 (100%)

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. Michigan Crash Summary
Page 22
Michigan Crash Summary
Performance
Measure
M50 &
Vermontville
Road (Eaton)
M100 & Mount
Hope Highway
(Eaton)
M37 & Peach
Ridge Avenue
(Kent)
M50 & 64th Street
M44 & Ramsdell
Driver (Kent)
M20 & Vance
Road (Midland)
Crash Frequency 14 13 18 24 46
Crash Severity Fat
Injury PD
1 (7%)
7 (50%)
6 (43%)
1 (8%)
7 (54%)
5 (38%)
1 (6%)
5 (28%)
12 (67%)
0 (0%)
11 (61%)
7 (39%)
6 (25%)
18 (75%)
12 (26%)
34 (74%)
Daily Entering ADT
6,925
7,115
26,875
8,090
8,730
18,700
Crash Rate
1.8
1.7
0.6
2.0
2.5
2.2
Expected Rate
0.4 (MN)
Critical Crash Rate
0.8
0.7
Angle Crashes
5 (36%)
9 (69%)
15 (83%)
9 (50%)
9 (38%)
14 (30%)

23. Georgia Process Census of all intersections that are:
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.