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Title: Short-Term Evaluation of Transition from Differential to Uniform Speed Limit for Trucks and Buses on Two-Lane Highways
Accession Number: 01647952
Record Type: Component
Record URL: Availability: Find a library where document is available Abstract: As of November 2016, Montana was the only state to maintain a differential speed limit on two-lane two-way rural highways, with a daytime statutory speed limit of 70 mph for cars and light trucks and 60 mph for trucks exceeding a 1-ton payload capacity. Although differential speed limits are common on freeways, the use of differential limits on two-lane roadways presents unique safety and operational issues because of passing limitations and the resultant platooning that occurs. Given these concerns, the speed limit was changed from the differential 70 mph to 60 mph speed limit to a uniform 65 mph limit for all vehicles along 55 mi of two-lane highway in April 2013. This study evaluated the short-term operational and safety impacts associated with this transition. Given the limited time period over which data were available following the speed limit change, surrogate safety measures were investigated to provide immediate feedback as to these impacts. A series of field studies was performed on two-lane rural highways in Montana, which predominantly possessed the 70 mph to 60 mph differential speed limit, as well as on selected locations along the 55 mi where the uniform speed limit was implemented. The locations with 65 mph speed limits generally exhibited shorter platoon lengths and less high-risk passing behavior. Overall, the preliminary findings provide some general support for transitioning to a uniform 65 mph speed limit on two-lane rural highways
Monograph Title: Monograph Accession #: 01628862
Report/Paper Numbers: 17-00081
Language: English
Authors: Hamzeie, RahaVafaei, BijanKay, Jonathan JSavolainen, Peter TGates, Timothy JPagination: pp 83-88
Publication Date: 2017
ISBN: 9780309441650
Media Type: Digital/other
Features: Figures; Photos; References; Tables
TRT Terms: Geographic Terms: Subject Areas: Highways; Motor Carriers; Operations and Traffic Management; Safety and Human Factors
Files: TRIS, TRB, ATRI
Created Date: Sep 25 2017 10:44AM
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