CMF / CRF Details
CMF ID: 4647
Provide a left-turn lane on one major-road approach
Description:
Prior Condition: Four-leg intersection without left-turn lanes
Category: Intersection geometry
Study: Safety Effectiveness of Intersection Left- and Right-Turn Lanes, Harwood et al., 2002
Star Quality Rating: | Cannot Be Rated (HSM) |
Rating Points Total: |
Crash Modification Factor (CMF) | |
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Value: | 0.82 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 18 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Minor Arterial |
Street Type: | |
Minimum Number of Lanes: | |
Maximum Number of Lanes: | |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | |
If countermeasure is intersection-based | |
Intersection Type: | Roadway/roadway (not interchange related) |
Intersection Geometry: | 4-leg |
Traffic Control: | Signalized |
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: | |
Municipality: | |
State: | |
Country: | |
Type of Methodology Used: | Expert panel |
Other Details | |
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Included in Highway Safety Manual? | |
Date Added to Clearinghouse: | Dec 01, 2009 |
Comments: | HSM 1st Ed, Table 14-11 |