STAA doubles

STAA doubles or double pups are a type of long combination vehicle that makes up less than 3% of the freight trailer fleet in the US. They are named for the Surface Transportation Assistance Act (STAA) of 1982.[1] Each trailer is 28.5 feet (8.7 meters) long and 8.5 feet (2.6 meters) wide. The doubles are connected via a dolly. This long combination vehicle is the only combination of trailers allowed nationwide in America. The axle weight allowed is 20,000 pounds (9,100 kg) per single axle.

STAA double pup 28.5 foot trailers

See also
  • B-train
  • Federal Bridge Weight Formula
  • Long combination vehicle

References
  1. Federal Highway Administration (September 9, 2017), "Chapter 3 - Scenario Descriptions" (PDF), Comprehensive Truck Size and Weight (CTS&W) Study, U.S. Department of Transportation
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