CMF / CRF Details
CMF ID: 4126
Increase shoulder width from 0 to 10 feet
Description: Increase shoulder width from 0 to 10 feet on rural, two-lane roads.
Prior Condition: Increase shoulder width from 0 feet to 10 feet on a rural, two-lane road. The CMF applies to single-vehicle crashes on horizontal curve sections.
Category: Shoulder treatments
Study: Investigating the Effect of Roadside Features on Single-Vehicle Roadway Departure Crashes on Rural Two-Lane Roads, Yichuan Peng, Srinivas Reddy Geedipally, and Dominique Lord, 2012
Star Quality Rating: | [View score details] |
Rating Points Total: | 80 |
Crash Modification Factor (CMF) | |
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Value: | 0.13 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 87 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | Run off road,Single vehicle |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | Not Specified |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 2 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | Undivided |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 3500 to Maximum of 3500 Average Daily Traffic (ADT) |
Average Traffic Volume: | 3500 Average Daily Traffic (ADT) |
Time of Day: | All |
If countermeasure is intersection-based | |
Intersection Type: | |
Intersection Geometry: | |
Traffic Control: | |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | 2003 to 2008 |
Municipality: | |
State: | TX |
Country: | USA |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 197 crashes |