CMF / CRF Details
CMF ID: 10362
Install sequential dynamic chevrons
Description: Install sequential dynamic chevrons (SDC) that provide a sequential pattern of light emitting diodes (LEDs).
Prior Condition: No Prior Condition(s)
Category: Signs
Study: Evaluation of Sequential Dynamic Chevrons on Rural Two-lane Highways, Hallmark, S., 2017
Star Quality Rating: | [View score details] |
Rating Points Total: | 105 |
Crash Modification Factor (CMF) | |
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Value: | 0.4 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.085 |
Crash Reduction Factor (CRF) | |
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Value: | 60 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 8.5 |
Applicability | |
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Crash Type: | Non-intersection |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
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: | |
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: | |
Municipality: | |
State: | CO,IA,MO,MT,TX,WA,WI |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 28 crashes after |
Sample Size (sites): | 18 sites before, 18 sites after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Mar 23, 2020 |
Comments: |