CMF / CRF Details
CMF ID: 9762
Install centerline rumble strips
Description:
Prior Condition: Two-lane undivided roadways
Category: Roadway
Study: Installation Guidance for Centerline and Edgeline Rumble Strips in Narrow Pavements, Savolainen et al., 2017
Star Quality Rating: | [View score details] |
Rating Points Total: | 115 |
Crash Modification Factor (CMF) | |
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Value: | 0.668 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.074 |
Crash Reduction Factor (CRF) | |
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Value: | 33.2 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 7.4 |
Applicability | |
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Crash Type: | Other |
Crash Severity: | All |
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: | Not specified |
Traffic Volume: | Minimum of 10 to Maximum of 17700 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 2428 Annual Average Daily Traffic (AADT) |
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: | 2014 to 2015 |
Municipality: | |
State: | IA |
Country: | United States |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 1254 crashes |
Sample Size (sites): | 13948 sites |
Sample Size (site-years): | 27896 site-years |
Sample Size (miles): | 5439.72 miles |
Sample Size (mile-years): | 10879.4 mile-years |