CMF / CRF Details
CMF ID: 10979
Install in-lane curve warning pavement markings
Description: Pavement marking showing the word "Slow" and an arrow to alert drivers to an upcoming curve in the road.
Prior Condition: No Prior Condition(s)
Category: Delineation
Study: Empirical Bayes before-after evaluation of horizontal curve warning pavement markings on two-lane rural highways in Pennsylvania, Wood and Donnell, 2020
Image: View the countermeasure image.
Star Quality Rating: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
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Value: | 0.769 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.14 |
Crash Reduction Factor (CRF) | |
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Value: | 23.1 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 14 |
Applicability | |
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Crash Type: | Run off road |
Crash Severity: | All |
Roadway Types: | Principal Arterial Other |
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: | Minimum of 100 to Maximum of 15998 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 2802 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: | 2005 to 2012 |
Municipality: | |
State: | PA |
Country: | |
Type of Methodology Used: |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Aug 15, 2022 |
Comments: |