CMF / CRF Details
CMF ID: 2932
Installation of lane narrowing through rumble strips and painted median at rural stop-controlled approaches
Description:
Installation of lane narrowing through rumble strips and painted median at rural stop-controlled approaches
Prior Condition: Major-road approach at rural intersections with two-lane, two-way roadways with two-way STOP-control
Category: Roadway
Crash Modification Factor (CMF) |
---|
Value: | 0.69 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | |
Crash Reduction Factor (CRF) |
---|
Value: | 31 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | |
Applicability |
---|
Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Not Specified |
Street Type: | |
Minimum Number of Lanes: | 1 |
Maximum Number of Lanes: | 1 |
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: | Roadway/roadway (not interchange related) |
Intersection Geometry: | 3-leg,4-leg |
Traffic Control: | Stop-controlled |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | |
Average Major Road Volume : | |
Average Minor Road Volume : | |
Development Details |
---|
Date Range of Data Used: | 1999 to 2009 |
Municipality: | |
State: | FL,KY,MO,PA |
Country: | |
Type of Methodology Used: | Simple before/after |
Sample Size (site-years): | 53 site-years before, 11 site-years after |
Other Details |
---|
Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Mar 21, 2011 |
Comments: | The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development. |