CMF / CRF Details
CMF ID: 10247
Change right-turn lane geometry to increase line of sight (approach level)
Description: Changes made to study approaches include: sharpening the flat approach angle typical in the traditional design, reducing the radius, adjusting the stop/yield bar position, and/or modifying the corner island to improve safety by increasing the line of sight of approaching through traffic.
Prior Condition: Conventional right turn channel.
Category: Intersection geometry
Study: Safety Effect of Smart Right-Turn Design at Intersections, Barua, U., 2018
Star Quality Rating: | [View score details] |
Rating Points Total: | 65 |
Crash Modification Factor (CMF) | |
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Value: | 0.6 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 40 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | Right turn |
Crash Severity: | K (fatal),A (serious injury) |
Roadway Types: | Principal Arterial Other |
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: | Divided by Median |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Urban |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | All |
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: | 2011 to 2018 |
Municipality: | Austin |
State: | TX |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 39 crashes before, 2 crashes after |
Sample Size (sites): | 1 sites before, 1 sites after |
Sample Size (site-years): | 6 site-years before, 1 site-years after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Dec 07, 2019 |
Comments: |