Determination of Freeway Acceleration Lane Length for Smooth and Safe Truck Merging

In the U.S., over 70% of the freight tonnage is moved by large trucks. Roadway design must accommodate large trucks to ensure the efficiency of freight transportation. The purpose of this research is to develop an analytical model to estimate the length of freeway acceleration lane to ensure large trucks can merge into freeway smoothly and safely. To achieve this goal, this research will first summarize current design guidelines on freeway acceleration lane length, with focus on those considering large trucks. Then, an analytical model will be developed for estimating the length of freeway acceleration lanes at freeway on-ramps according to the merging distances required by the large trucks. This model will consider both the acceleration and gap searching needs of merging trucks. Field studies at selected on-ramp locations will be conducted to collect data for developing and validating the model. After that, a model for estimating the required freeway acceleration length for large trucks will be provided, and the adequate acceleration lengths under different traffic conditions will be recommended according to the modeling results. The results of this research will help complement the current federal and state design guidelines on freeway acceleration lane length by considering the unique characteristics of large trucks.


    • English


    • Status: Completed
    • Funding: $90298
    • Contract Numbers:


    • Sponsor Organizations:

      Center for Advanced Multimodal Mobility Solutions and Education

      University of North Carolina, Charlotte
      Charlotte, NC  United States  28223

      Office of the Assistant Secretary for Research and Technology

      University Transportation Centers Program
      Department of Transportation
      Washington, DC  United States  20590
    • Managing Organizations:

      University of North Carolina, Charlotte

      Department of Civil and Environmental Engineering
      9201 University City Boulevard
      Charlotte, NC  United States  28223-0001
    • Project Managers:

      Fan, Wei

    • Performing Organizations:

      Texas Southern University, Houston

      3100 Cleburne Street
      Houston, TX  United States  77004
    • Principal Investigators:

      Qi, Yi

    • Start Date: 20171001
    • Expected Completion Date: 20190930
    • Actual Completion Date: 20190930

    Subject/Index Terms

    Filing Info

    • Accession Number: 01652824
    • Record Type: Research project
    • Source Agency: Center for Advanced Multimodal Mobility Solutions and Education
    • Contract Numbers: 69A3551747133
    • Files: UTC, RIP
    • Created Date: Dec 3 2017 10:44AM