Louisiana two-lane rural roads possess a low geometric standard with very low AADT but more fatalities and fatal crashes compared to other type of roads. Previous studies present results of significant safety improvement due to installation of centerline rumble strips specially in preventing head on and opposite direction sideswipe crashes. LADOTD has installed over 2,100 miles of centerline rumble strips all nine district wide during 2010-2012. This study used three years of crash data for the before and after time period and applied the Empirical Bayes (EB) method in the analysis to estimate the crash modification factors of centerline rumble strips for rural two-lane roads. Estimated CMF is 0.89, which means there is a 11% expected crash reduction in implementation of centerline rumble strips on rural two-lane highways. The statistically estimated standard deviation for the CMF is 0.03. Moreover, crash characteristics analysis was performed in this study to compare the difference before and after center line rumble strip implementation. The crash reduction is consistent in all crash types and particularly significant in targeted cross centerline injury crashes.
|Commitee:||Khattak, Mohammad Jamal, McManis, Kenneth L.|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/01M(E), Masters Abstracts International|
|Subjects:||Engineering, Civil engineering, Transportation planning|
|Keywords:||Before-after study, Centerline rumble strips, Highway safety, Louisiana, Rumble strips, Rural two-lane roads|
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