CMF / CRF Details
CMF ID: 2011
Convert 12-ft lanes and 6-ft shoulders to 11-ft lanes and 6-ft shoulders
Description:
Prior Condition: 2-lane rural, undivided. Total width = 28 ft; Lane width = 11 ft; Shoulder width = 3 ft
Category: Roadway
Study: Safety Effectiveness of Lane and Shoulder Width Combinations on Rural, Two-Lane, Undivided Roads, Gross et al., 2009
Star Quality Rating: | [View score details] |
Rating Points Total: | 105 |
Crash Modification Factor (CMF) | |
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Value: | 0.84 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.046 |
Crash Reduction Factor (CRF) | |
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Value: | 16 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 4.6 |
Applicability | |
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Crash Type: | Run off road |
Crash Severity: | All |
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 1000 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | |
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: | 1997 to 2001 |
Municipality: | |
State: | PA |
Country: | |
Type of Methodology Used: | Case-control |
Sample Size (sites): | 1597 sites |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Dec 01, 2009 |
Comments: |