What is the average total stopping distance of a tractor unit (no trailer) traveling at 55 MPH?

193 feet.
430 feet.
243 feet.
93 feet.
Explanation

A tractor, even without a trailer attached, has a longer stopping distance than a smaller vehicle traveling at the same speed. If a tractor unit is traveling at 55 mph, it will cover roughly 243 feet once the driver begins stopping.

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