On dry pavement, you are driving a vehicle at 55 mph. How much total stopping distance will you need to stop the vehicle?

Perception Distance + Reaction Distance + Braking Distance = Total Stopping Distance
The total minimum distance your vehicle has traveled, in ideal conditions, with everything considered, including perception distance, reaction distance, and braking distance, until you can bring your vehicle to a complete stop. At 55 mph, your vehicle will travel a minimum of 419 feet.
[California Commercial Driver Handbook]