Washington has truck regulations that keep it competitive with neighboring states and British Columbia. Trucks can gross up to 105,500 lbs and have longer double trailer lengths available under a permit. Because of this, B-Train units for heavier loads travel in Washington State. Another unusual dimension that is specified in Washington State is that a load overhanging the rear of the vehicle is not measured from the end of the vehicle, but from the center of the rearmost axle.

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