Three second rule — Rhode Island Permit Test

Rhode Island teaches the three-second rule for following distance; it cannot always guarantee time to stop, but it works in most situations.

At two seconds or less, the car ahead can stop before you have even moved your foot to the brake.

The following three-second rule cannot always guarantee you time to stop to avoid a collision, but it works in most situations.

To check following distance, start counting when the rear bumper of the vehicle ahead passes a fixed point such as a sign, pole or line.

Without a fixed point to count from, a guess at following distance is almost always too short.

You are following another vehicle and that vehicles rear bumper passes a fixed point (traffic sign, overpass, pole, tree, a line on the pavement, etc.) you start counting seconds, ‘one-thousand and one, two-thousand and two, three- thousand and three’.

If your front bumper passes the fixed point before you finish counting to 3, you are following too closely; reduce your speed and count again.

Tailgating leaves no room when the car ahead brakes, and rear-end crashes follow.

If your vehicle’s front bumper passes the point before you finish counting to three, you are following too close to the vehicle in front of you.

In bad weather or road conditions, add 1 more second of following distance for each imperfect condition.

Wet roads, fog and darkness each add to the time and distance you need to stop.

When driving under adverse weather/road conditions, be sure to increase your following distance an additional second for EACH imperfect condition.

Under Rhode Island's following-distance rule, how many seconds behind should you stay in good conditions?

3 seconds. At two seconds or less, the car ahead can stop before you have even moved your foot to the brake. Rhode Island Driver’s Manual, p.50: “The following three-second rule cannot always guarantee you time to stop to avoid a collision, but it works in most situations.”