Title page for ETD etd-07102009-115117

Type of Document Master's Thesis
Author Korkut, Murat
Author's Email Address mkorku1@lsu.edu
URN etd-07102009-115117
Title Freeway Crash and Lane Compliance Under Truck Lane Restriction and Differential Speed Limit
Degree Master of Science in Civil Engineering (M.S.C.E.)
Department Civil & Environmental Engineering
Advisory Committee
Advisor Name Title
Sherif Ishak Committee Chair
Brian Wolshon Committee Co-Chair
Chester Wilmot Committee Member
  • elevated freeway
  • differential speed limit
  • truck lane restriction
  • crash rate
Date of Defense 2009-06-26
Availability unrestricted
In the last decade, several fatal truck related crashes occurred on the elevated freeway over the Atchafalaya Basin. In an attempt to reduce the crash rates, the Louisiana Department of Transportation and Development implemented two policies to regulate the truck traffic on this rural divided freeway that has two lanes in each direction of flow. These policies restricted truck traffic to the right lane and reduced the maximum truck speed limit to 55-mph. On the other hand, maximum car speed limit was kept at 60-mph. The changes took place in 2003. While the policies were in effect, crash and traffic data were collected over the freeway. This study investigated the relationship between crash rates and traffic characteristics such as lane distribution of truck traffic, truck and car percentages exceeding the speed limits, difference between truck and car speeds, speed variance, truck volume, and lane occupancy. Multiple linear regression of total and truck-involved crash rates on the traffic characteristics showed that violation of the lane restriction and truck speed limit, truck speed variance, difference between car and truck hourly mean speeds, and lane occupancy were positively correlated with the crash rates.
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