Truck-tractor semitrailer-semitrailer.

Truck-tractor semitrailer-semitrailer. In a truck-tractor semitrailer-semitrailer combination vehicle, the two trailing units are connected with a B-train assembly. The B-train assembly is a rigid frame extension attached to the rear frame of a first semitrailer which allows for a fifth wheel connection point for the second semitrailer. This combination has one less articulation point than the conventional A dolly connected truck-tractor semitrailer-trailer combination.


23 CFR § 658.5

Scoping language

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