How does speed affect stopping distance?
Quick Answer
Stopping distance increases dramatically with speed. At 30 mph, stopping distance is about 75 feet. At 60 mph, it is about 240 feet — four times longer. This is because kinetic energy increases with the square of velocity. Doubling your speed quadruples your stopping distance.
Explanation
Stopping distance increases dramatically with speed. At 30 mph, stopping distance is about 75 feet. At 60 mph, it is about 240 feet — four times longer. This is because kinetic energy increases with the square of velocity. Doubling your speed quadruples your stopping distance. Understanding this concept is essential for safe driving and will help you answer similar questions on the DMV written test.
Why This Matters on the DMV Test
Questions about Speed Limits are among the most common on the permit test. Knowing the correct answer helps you pass your exam and stay safe on the road. Most states require a score of 70–83% to pass.
Practice More Questions Like This
Take a free DMV practice test with real exam-style questions.
Start Practice Test