How long does a tractor-trailer typically need to clear an intersection from a complete stop?

A loaded 53-foot tractor-trailer accelerating from a standstill needs roughly 14 seconds to fully clear a standard intersection. This is far longer than the time a passenger car needs and matters enormously when judging gaps in cross traffic. A driver pulling onto a road without enough gap can leave the rear of the trailer hanging in the intersection long after the light cycle changes. The exact time depends on grade, load, and gear, but plan for at least 14 seconds when crossing or merging. Underestimating this gap is a common cause of fatal collisions involving commercial vehicles. When in doubt, wait for a clearly larger gap than seems necessary.