Study Details
Study Title: Crash Modification Factors for High-Friction Surface Treatment in Pennsylvania
Authors: Gayah et al.
Publication Date:JUN, 2023
Abstract: The objective of this project was to develop a suite of crash modification factors (CMFs) to quantify the safety impacts of installing high-friction surface treatments (HFSTs) on horizontal curves and intersections within the Commonwealth of Pennsylvania. An empirical Bayes observational before-after study was performed to develop CMFs for this countermeasure. The propensity score matching framework was also used to identify an appropriate reference group of horizontal curves as comparison sites. CMFs were estimated for horizontal curves on two-lane rural roads, and the analysis found that HFST was associated with a statistically significant reduction in crash frequency of between 30% and 76% for all crash types considered. At intersections, HFST was associated with a statistically significant reduction in crash frequency of between 66% and 76%. The results are in line with engineering expectation, as HFST provides additional friction on the roadway surface that can help drivers maintain control.
Study Citation: Gayah, V., E.T. Donnell, and P. Zhang. "Crash Modification Factors for High-Friction Surface Treatment in Pennsylvania" Report No. PennDOT-2023-ECMS-E04834-WO15. The Pennsylvania Department of Transportation. Harrisburg, Pennsylvania. (June 2023).
CMFs Associated With This Study
Category: Roadway
Countermeasure: Install high friction surface treatment (HFST)
CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
---|---|---|---|---|---|---|
0.466 | 53.4 | All | All | Not specified | Rural |
0.513 | 48.7 | All | K,A,B,C | Not specified | Rural |
0.514 | 48.6 | All | O | Not specified | Rural |
0.477 | 52.3 | Run off road | All | Not specified | Rural |
0.491 | 50.9 | Fixed object | All | Not specified | Rural |
0.273 | 72.7 | All | All | Not specified | Rural |
0.368 | 63.2 | Head on | All | Not specified | Rural |
0.506 | 49.4 | Sideswipe | All | Not specified | Rural |
0.56 | 44 | Run off road | K,A,B,C | Not specified | Rural |
0.58 | 42 | Fixed object | K,A,B,C | Not specified | Rural |
0.332 | 66.8 | All | K,A,B,C | Not specified | Rural |
0.31 | 69 | Head on | K,A,B,C | Not specified | Rural |
0.334 | 66.6 | All | All | Not specified | All |
0.234 | 76.6 | All | K,A,B,C | Not specified | All |
0.422 | 55.8 | All | All | Not specified | All |
0.522 | 47.8 | All | K,A,B,C | Not specified | All |
0.417 | 58.3 | All | O | Not specified | All |
0.457 | 54.3 | Run off road | All | Not specified | All |
0.477 | 52.3 | Fixed object | All | Not specified | All |
0.244 | 75.6 | All | All | Not specified | All |
0.501 | 49.9 | Head on | All | Not specified | All |
0.7 | 30 | Sideswipe | All | Not specified | All |
0.649 | 35.1 | Run off road | K,A,B,C | Not specified | All |
0.672 | 32.8 | Fixed object | K,A,B,C | Not specified | All |
0.326 | 67.4 | All | K,A,B,C | Not specified | All |
0.444 | 55.6 | All | All | Not specified | All |
0.5 | 50 | All | K,A,B,C | Not specified | All |
0.455 | 54.5 | All | O | Not specified | All |
0.458 | Run off road | All | Not specified | All |
0.47 | 53 | Fixed object | All | Not specified | All |
0.246 | 75.4 | All | All | Not specified | All |
0.49 | 51 | Head on | All | Not specified | All |
0.467 | 53.3 | Sideswipe | All | Not specified | All |
0.584 | 41.6 | Run off road | K,A,B,C | Not specified | All |
0.6 | 40 | Fixed object | K,A,B,C | Not specified | All |
0.298 | 70.2 | All | K,A,B,C | Not specified | All |
0.539 | 46.1 | Head on | K,A,B,C | Not specified | All |
0.673 | 32.7 | Sideswipe | K,A,B,C | Not specified | All |
0.388 | 61.2 | All | All | Not specified | Urban |
0.496 | 50.4 | All | K,A,B,C | Not specified | Urban |
0.366 | 63.4 | All | O | Not specified | Urban |
0.457 | 54.3 | Run off road | All | Not specified | Urban |
0.462 | 53.8 | Fixed object | All | Not specified | Urban |
0.222 | 77.8 | All | All | Not specified | Urban |
0.534 | 46.6 | Head on | All | Not specified | Urban |
0.667 | 33.3 | Sideswipe | All | Not specified | Urban |
0.692 | 30.8 | Run off road | K,A,B,C | Not specified | Urban |
0.715 | 28.5 | Fixed object | K,A,B,C | Not specified | Urban |
0.324 | 67.6 | All | K,A,B,C | Not specified | Urban |
0.478 | 52.2 | All | All | Not specified | Rural |
0.563 | 43.7 | All | K,A,B,C | Not specified | Rural |
0.506 | 49.4 | All | O | Not specified | Rural |
0.457 | 54.3 | Run off road | All | Not specified | Rural |
0.496 | 50.4 | Fixed object | All | Not specified | Rural |
0.279 | 72.1 | All | All | Not specified | Rural |
0.409 | 59.1 | Head on | All | Not specified | Rural |
0.776 | 22.4 | Sideswipe | All | Not specified | Rural |
0.603 | 39.7 | Run off road | K,A,B,C | Not specified | Rural |
0.626 | 37.4 | Fixed object | K,A,B,C | Not specified | Rural |
0.327 | 67.3 | All | K,A,B,C | Not specified | Rural |
0.431 | 56.9 | All | All | Not specified | Urban |
0.492 | All | K,A,B,C | Not specified | Urban |
0.425 | 57.5 | All | O | Not specified | Urban |
0.445 | 55.5 | Run off road | All | Not specified | Urban |
0.456 | 54.4 | Fixed object | All | Not specified | Urban |
0.232 | 76.8 | All | All | Not specified | Urban |
0.524 | 47.6 | Head on | All | Not specified | Urban |
0.453 | 54.7 | Sideswipe | All | Not specified | Urban |
0.603 | Run off road | K,A,B,C | Not specified | Urban |
0.616 | 38.4 | Fixed object | K,A,B,C | Not specified | Urban |
0.28 | 72 | All | K,A,B,C | Not specified | Urban |
0.617 | 38.3 | Head on | K,A,B,C | Not specified | Urban |
0.683 | 31.7 | Sideswipe | K,A,B,C | Not specified | Urban |