CMF / CRF Details
CMF ID: 9058
Install supplemental intersection shaped pavement markings
Description: At uncontrolled approaches, the Pennsylvania Department of Transportation deployed a unique set of supplementary pavement markings on the major-road approaches (i.e., uncontrolled approaches) at intersections with minor-road stop control. These markings are intended to alert drivers of the presence of the intersection and of the potential for vehicles and other road users entering or exiting the roadway at that location. The treatment consists of two sets of pavement markings. In the direction of travel, the first set of markings warns drivers to slow to the speed limit of the roadway (e.g., “SLOW, XX MPH,”). The second set of markings illustrates the configuration of the upcoming intersection as either 4 legs or 3 legs with one of the following symbols: ┼, ├, or ┤. For 3-leg intersections, the symbol indicates the side of the roadway from which the minor road intersects the major road.
Prior Condition: No supplemental intersection shaped pavement markings
Category: Delineation
Study: Advancing Innovating Intersection Safety Treatments for Two-Lane Rural Highways, Torbic et al., 2015
Image: View the countermeasure image.
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 100 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.58 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.08 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 42 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 8 |
| Applicability | |
|---|---|
| Crash Type: | Angle |
| 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: | |
| 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: | Uncontrolled |
| Major Road Traffic Volume: | Minimum of 1890 to Maximum of 16270 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 180 to Maximum of 5380 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | |
| State: | PA |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 43 crashes before, 64 crashes after |
| Sample Size (sites): | 11 sites before, 11 sites after |
| Sample Size (site-years): | 52 site-years before, 58 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 17, 2018 |
| Comments: | |
