CMF / CRF Details
CMF ID: 8941
Implement systemic signing and visibility improvements at signalized intersections
Description: Replace all signal heads. Replace pedestrian signal heads, pushbuttons, and signs. Install backplates with retroreflective borders on all signal heads. Re-stripe stop lines. Re-stripe crosswalks. Install advance warning signs. Install overhead signs (e.g., R10‐12, R3‐5L, R3‐5R in the MUTCD(4)). Install curb ramps.
Prior Condition: Signalized intersection without systemic signing and visibility improvements
Category: Intersection traffic control
Study: Safety Effects of Low-Cost Systemic Safety Improvements at Signalized and Stop-Controlled Intersections, Le et al., 2017
Star Quality Rating: | [View score details] |
Rating Points Total: | 90 |
Crash Modification Factor (CMF) | |
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Value: | 1.044 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.126 |
Crash Reduction Factor (CRF) | |
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Value: | -4.4 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 12.6 |
Applicability | |
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Crash Type: | Nighttime |
Crash Severity: | All |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 4 |
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: | All |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Night |
If countermeasure is intersection-based | |
Intersection Type: | |
Intersection Geometry: | 3-leg |
Traffic Control: | Signalized |
Major Road Traffic Volume: | Minimum of 4272 to Maximum of 41100 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 111 to Maximum of 20000 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | 20447 Annual Average Daily Traffic (AADT) |
Average Minor Road Volume : | 5864 Annual Average Daily Traffic (AADT) |
Development Details | |
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Date Range of Data Used: | 2005 to 2014 |
Municipality: | |
State: | SC |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (sites): | 14 sites before, 14 sites after |