United States Department of Transportation
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners.
As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
i
Safety performance evaluation of converging chevron pavement markings : final report.
-
2014-12-01
[PDF-4.78 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final report
-
Corporate Publisher:
-
Abstract:The objectives of this study were (1) to perform a detailed safety analysis of converging chevron
pavement markings, quantifying the potential safety benefits and developing an understanding of the
incident types addressed by the treatment, and (2) to develop guidance for selecting additional
implementation sites that have a high likelihood of significant improvements in safety performance.
Some important conclusions from this study are the following:
- Analysis of the demographic variables showed no statistically significant observations that the
effectiveness of the chevron treatment in reducing crashes was influenced by driver age,
gender, proximity of driver registration, daytime/nighttime or pavement conditions.
- The chevron markings are effective at reducing crashes for the curved portions of ramps when
evaluated using the before and after periods, regardless of the type of base conditions selected.
Crash modification factors (CMFs) ranged from 0.453 to 0.689. The lower limit of the 95%
confidence interval ranges from 0.281 to 0.428 while the upper limit ranges from 0.624 to
0.949. This indicates that even in the least effective scenario, the treatment still has the
potential to reduce crashes by 5.1%.
- The chevron markings were effective for the approaches to the ramp (Ramp Section 1), the
ramp segment where the treatment would generally be installed, when evaluated using the
before and after periods. When evaluated using calendar year 2007 and 2009 data, no tangible
benefits were observed. Fatal/injury-only crashes were not evaluated for this ramp segment
due to small sample size.
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
