Here’s how the following distance rule works:
- Glance at the vehicle ahead as it passes a fixed object, such as an overpass, sign, fence, corner or other fixed mark.
- Begin counting the seconds it takes you to reach the same place in the road.
- If you reach the mark before you have counted off two, three, or four seconds, depending on speed, you’re following too closely. Slow down and increase your following distance.
- For bad weather conditions, heavy traffic, poor pavement of if your vehicle is in poor condition, add extra seconds to increase your following distance.
Drivers need to change following distance when speed or road conditions change. Hand response time is close to half second. Foot response time is normally three-quarters of a second. This does not take into account any delay in perception time as a result of the driver being tired, on medication, distracted, etc. Road conditions, speed, driver alertness, and even following vehicles of different weights all change the ability to stop.