NDLI: Impacts of Truck-Lane Restrictions on Freeway Traffic Operations

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Impacts of Truck-Lane Restrictions on Freeway Traffic Operations

Content Provider	Semantic Scholar
Author	Jo, Sijong Gan, Albert Han Ming
Copyright Year	2003
Abstract	Highways are generally designed to serve a mixed traffic flow that consists of passenger cars, trucks, buses, recreational vehicles, etc. The impacts of these different vehicle types are not uniform, thus, create special problems in highway operations and safety. One common approach to reducing the impacts of truck traffic on freeways has been to impose certain lane restrictions on trucks. Truck-lane restrictions may increase the overall operational efficiency of freeways, lead to improved traffic safety on these facilities, and provide uniform pavement wear. A variety of truck restriction methods have been implemented throughout the United States. Most restrictions, however, have been used without detailed planning or evaluation through before and after studies. The purpose of this study was to analyze changes in various measures of effectiveness (MOEs) including speed, capacity, density, and lane changes under various traffic conditions and restriction strategies. The CORSIM simulation model was used to model the effects of various truck-lane restrictions on basic freeway sections. For model development, carfollowing sensitivity factors were calibrated to emulate the freeway speed-flow curves in HCM 2000. Various scenarios were constructed to replicate prevailing conditions with combinations of number of lanes, free-flow speed, volumes, truck percentage, and restriction methods. Paired t-test was used to assess the changes in MOE before and after truck-lane restrictions. It was found that: (1) truck-lane restrictions reduce average speed and capacity and increase density; (2) truck-lane restrictions reduced the lane changes for all cases, except when there is a high number of restricted lanes; and (3) changes in density, speed, capacity, or lane changes after truck-lane restriction increased with increasing number of restricted lanes.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ltrc.lsu.edu/TRB_82/TRB2003-002410.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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