Space Cushion and Following Distance

Key points

1. A safe following distance is 2 to 4 seconds; above 30 mph it should be 4 seconds or more.

   Source: Handbook p. 26

   “A safe following distance is defined as 2-4 seconds. For speeds greater than 30 mph, a safe following distance should be 4 seconds or more”
   Oregon Driver Manual, Handbook p. 26

2. Count from when the car ahead passes a fixed mark; you are too close if you reach it in under 2 seconds.

   Source: Handbook p. 27

   “You are following too closely if you pass the mark before you finish counting at least two seconds.”
   Oregon Driver Manual, Handbook p. 27

3. When stopped behind a vehicle, you should see where its rear tires meet the road.

   Source: Handbook p. 27

   “When stopping behind another vehicle, make sure you can see where the rear tires of the vehicle in front meet the road.”
   Oregon Driver Manual, Handbook p. 27

4. Increase your following distance on wet or slippery roads, because you need more distance to stop.

   Source: Handbook p. 27

   “On wet or slippery roads. You need more distance to stop your vehicle.”
   Oregon Driver Manual, Handbook p. 27

5. Never brake hard to discourage a tailgater; you could get hit from behind.

   Source: Handbook p. 29

   “Never brake hard to discourage tailgating; you could get hit from behind.”
   Oregon Driver Manual, Handbook p. 29

6. At 60 mph, your total stopping distance is longer than a football field.

   Source: Handbook p. 29

   “At 60 mph, the distance traveled from the point you recognize a hazard ahead and apply the brakes, to where your vehicle comes to a stop is greater than the length of a football field.”
   Oregon Driver Manual, Handbook p. 29

7. Before changing lanes, glance over the shoulder on the side you are moving toward.

   Source: Handbook p. 30

   “Glance over your left shoulder if you are moving left. Glance over your right shoulder if you are moving right”
   Oregon Driver Manual, Handbook p. 30

Numbers to know

3 questions from the Oregon practice test

1. 1. What following distance does the Oregon manual define as safe in ordinary conditions?

   1. One second at every speed
   2. Exactly one car length
   3. Two to four seconds
   4. Ten seconds only on freeways
   Show answer

   Two to four seconds. The manual defines a safe following distance as two to four seconds in ordinary driving. When traveling faster than 30 mph, it advises four seconds or more, because higher speed leaves less time to notice a hazard and increases stopping distance. One car length is not a dependable measure because the needed space changes with speed. Ten seconds is not the standard baseline. Pick a fixed object, wait for the vehicle ahead to pass it, and count until your own vehicle reaches that point.

2. 2. What advice does the Oregon manual give about letting a driver signaling for a lane change move over?

   1. Help by slowing down or speeding up a little if needed
   2. Speed up to close the gap
   3. Hold your speed exactly
   4. Flash the high beams
   Show answer

   Help by slowing down or speeding up a little if needed. Sharing space means adjusting for others. The manual says to help other drivers signaling for a lane change make the move safely by slowing down or speeding up a little if needed, to move over a lane for vehicles entering a freeway when no one is beside you, and to keep extra space from parked cars because a door may open in your path. Closing the gap or refusing to adjust invites a sideswipe.

3. 3. When road conditions become hazardous because visibility or traction is reduced, you should:

   1. Maintain the posted speed and shorten your following distance
   2. Follow close behind another vehicle for guidance
   3. Use cruise control to keep your speed steady
   4. Drive more slowly and leave extra space behind the vehicle ahead
   Show answer

   Drive more slowly and leave extra space behind the vehicle ahead. Oregon advises slower speeds and greater following distances when visibility is reduced or the pavement is wet, snowy, or icy. The choice “Maintain the posted speed and shorten your following distance” removes the time and stopping room that changing conditions require. Cruise control is especially unsuitable on wet roads because it can encourage continued speed when traction is limited. Following closely does not provide reliable guidance and leaves less room to brake if the lead vehicle stops. A useful cue is to match the conditions, not merely the posted number, then add space before trouble appears.

Source: the Oregon Driver Manual, Lane Travel: Maintaining a Space Cushion. This lesson is a plain English summary, not the law itself; where it differs, the manual and the statute govern. Last checked 2026-09-27.