Under ideal conditions, approximately how far does a vehicle travel before stopping from 55 mph?
Correct answer: D – 419 feet
At 55 mph, the total minimum stopping distance under ideal conditions is approximately 419 feet. This includes about 142 feet of perception distance, 61 feet of reaction distance, and 216 feet of braking distance. Poor traction, visibility, brakes, or driver condition can increase the distance.
Source: Nebraska Commercial Driver’s License Manual — § 2.6.1, “Stopping Distance”

