CMF / CRF Details
CMF ID: 8176
Decrease lane width from 11 feet to 9 feet
Description:
Prior Condition: 11-ft lane width
Category: Roadway
Study: Estimating the safety effects of lane widths on urban streets in Nebraska using the propensity scores-potential outcomes framework, Wood et al., 2015
Star Quality Rating: | [View score details] |
Rating Points Total: | 95 |
Crash Modification Factor (CMF) | |
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Value: | 0.51 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.196 |
Crash Reduction Factor (CRF) | |
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Value: | 49 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 19.6 |
Applicability | |
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Crash Type: | Rear end |
Crash Severity: | All |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 12 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | All |
Minimum Speed Limit: | 25 |
Maximum Speed Limit: | 60 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Urban |
Traffic Volume: | Minimum of 100 to Maximum of 19480 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 5348 Annual Average Daily Traffic (AADT) |
Time of Day: | Not specified |
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 2012 |
Municipality: | |
State: | NE |
Country: | USA |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 4360 crashes |
Sample Size (sites): | 6791 sites |
Sample Size (site-years): | 67910 site-years |
Sample Size (miles): | 2628 miles |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Nov 10, 2016 |
Comments: | CMF for changing from 11ft to 9ft lane width. Applies to urban minor arterials and collectors. |