CMF / CRF Details
CMF ID: 4111
Improve signal visibility, including signal lens size upgrade, installation of new back-plates, addition of reflective tapes to existing back-plates, and installation of additional signal heads
Description:
4-leg intersections with 3 or 4 lanes on each approach and 50 km/h posted speed
Prior Condition: Smaller signal lens size, old back-plates, no reflective tapes on existing back-plates, and less number of signal heads
Category: Intersection traffic control
Crash Modification Factor (CMF) |
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Value: | 0.902 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.056 |
Crash Reduction Factor (CRF) |
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Value: | 9.8 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 5.6 |
Applicability |
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Crash Type: | Nighttime |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | Not Specified |
Street Type: | |
Minimum Number of Lanes: | 3 |
Maximum Number of Lanes: | 4 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | |
Minimum Speed Limit: | 50 |
Maximum Speed Limit: | 50 |
Speed Unit: | km/h |
Speed Limit Comment: | |
Area Type: | Urban |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Night |
If countermeasure is intersection-based |
Intersection Type: | Roadway/roadway (not interchange related) |
Intersection Geometry: | 4-leg |
Traffic Control: | Signalized |
Major Road Traffic Volume: | Minimum of 4637 to Maximum of 51743 Average Daily Traffic (ADT) |
Minor Road Traffic Volume: | Minimum of 134 to Maximum of 48906 Average Daily Traffic (ADT) |
Average Major Road Volume : | 20876 Average Daily Traffic (ADT) |
Average Minor Road Volume : | 11014 Average Daily Traffic (ADT) |
Development Details |
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Date Range of Data Used: | 1999 to 2004 |
Municipality: | British Columbia |
State: | notusa |
Country: | Canada |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 1223 crashes before, 646 crashes after |
Other Details |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Nov 01, 2012 |
Comments: | 3 CMF sets are presented: crash severity only, time of day only, severity and time of day. Only disaggregate set (severity and time of day) is reported |