Illinois Driving Permit Practice Test

What is a safe following distance behind another vehicle?

1. 1 car length

2. 2 seconds

3. 3 seconds

4. 4 seconds

The correct answer is: 3 seconds

A safe following distance behind another vehicle is generally considered to be at least 3 seconds. This practice allows drivers sufficient time to react in case the vehicle in front of them suddenly stops or slows down. The 3-second rule is a widely accepted guideline that helps ensure safe driving habits, particularly in varying conditions such as poor weather or heavy traffic. To determine a proper following distance using this rule, you can pick a fixed point on the road (like a sign or a tree) and start counting when the vehicle in front of you passes that point. If you reach that same point before you finish counting to three, you are likely following too closely and should increase your distance. This approach enhances safety by allowing enough space to brake or maneuver as needed. While other options imply shorter or longer distances, 3 seconds is the most balanced recommendation, providing adequate time to respond without being excessively far behind, which could lead to congestion issues or losing track of the vehicle ahead.