California DMV Permit Test (Class C)Safe Driving PracticesHard
You are driving on a freeway at 65 mph. The vehicle in front of you suddenly brakes hard. What is the minimum safe following distance you should have maintained before the braking, assuming ideal dry conditions?
- A2 seconds
- B4 seconds
- C3 seconds
- D5 seconds
Show answer & explanationAnswer & explanation
Correct answer: C. 3 seconds
The California Driver Handbook recommends a minimum 3-second following distance in ideal dry conditions. This allows enough time to react and stop safely if the vehicle ahead suddenly brakes. At 65 mph, this translates to approximately 292.5 feet (65 mph * 1.467 ft/sec/mph * 3 seconds).
Why the other options are wrong
- A. 2 seconds is generally considered a minimum in some conditions but 3 seconds is the recommended minimum in California for most situations.
- B. While safer, 4 seconds is typically recommended for less ideal conditions, not the minimum for ideal.
- D. 5 seconds is for adverse conditions, not the minimum for ideal dry conditions.
Three-Second Rule
Maintain at least a three-second following distance from the vehicle ahead in ideal dry conditions to allow for safe reaction and stopping.
- Increase to 4-5 seconds in adverse weather (rain, fog, ice).
- Increase for large vehicles, motorcycles, or when towing.
- To measure, pick a fixed object and count 'one-thousand-one, one-thousand-two, one-thousand-three' after the car ahead passes it.
Memory trick: Three-second rule: 'One-Mississippi, Two-Mississippi, Three-Mississippi' is your safe space plea.