Alberta Motor Association (AMA) Learner’s Practice Exam

Total stopping distance is calculated by adding the three critical components involved in bringing a vehicle to a complete stop. These components are perception distance, reaction distance, and braking distance.

Perception distance is the distance a vehicle travels while the driver notices a hazard and begins to react. This accounts for the time it takes to recognize that a stop is necessary. Reaction distance is the distance covered during the driver’s reaction time, which is the moment from deciding to stop to actually applying the brakes. Finally, braking distance is the distance it takes to stop after the brakes have been applied, which depends on factors such as vehicle speed, road conditions, and brake efficiency.

Combining all these distances gives a comprehensive measure of total stopping distance, which is vital for safe driving, especially in emergency situations. Understanding this formula is essential for drivers to gauge how far they need to stop based on their reaction speed and vehicle dynamics.