Evaluate Specialized Hauling Vehicles with Regard to Pavement and Bridge Deterioration and Posting Limits

The Federal Highway Administration (FHWA) requires a state to certify that it does not permit operation of Specialized Hauling Vehicles (SHV) or conducts bridge force effects load rating analyses consistent with the standard American Association of State Highway and Transportation Officials (AASHTO) H820 or HL93 loads and applicable SHV loads based on five configurations (SU4. SU 5, SU6 and SU 7) identified in the AASHTO Manual on Bridge Evaluation. A single-unit truck is designed such that the engine driver compartment and the cargo are carried on the same truck chassis. An SHV is a modified single-unit truck with 4 to 7 axles. The SHV can be modified by adding 1 to 4 liftable axles that can be raised once the cargo is delivered or, when the SHV is loaded, making steering through an intersection easier, though the potential for overturning might be increased. SHVs may be designed as: dump trucks, construction trucks, ready mix trucks, solid waste trucks and other vehicle types. The research team will obtain field data to determine where SHVs operate in Texas: the numbers and types of SHV configurations; axle loads, axle spacing and Gross Vehicle Weights. The research team will conduct pavement and bridge load rating analyses and will determine load posting requirements. The research team will evaluate the deterioration (consumption) rates for pavements and bridges when all axles are on the ground and when axles are lifted to accommodate steering and other operations. The research team will evaluate safety by comparing the difference in SHV operating characteristics and crash history compared to common single unit and tractor-semi trailer truck configurations in Texas. The research team will provide draft policy and legislation to manage SHV operations and load posting sign layouts for the Texas Manual on Uniform Traffic Control Devices (MUTCD).


  • English


  • Status: Completed
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Glancy, Chris

  • Performing Organizations:

    Center for Transportation Research

    University of Texas at Austin
    1616 Guadalupe, Suite 4.202
    Austin, Texas  United States  78701
  • Principal Investigators:

    Walton, C

  • Start Date: 20150901
  • Expected Completion Date: 20170831
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01619635
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6897
  • Files: RiP, STATEDOT
  • Created Date: Dec 21 2016 11:59AM