Professional Driver's Handbook


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Following distance

You should be constantly on the defensive to prevent a rear-end collision with other vehicles. This applies not only to the vehicle you are following, but also to the vehicles following you.

The collision from behind may not always be avoidable, but the professional driver can reduce the probability. The first step in prevention is assuring that your own stops are smooth and gradual. To do this, practise these simple but effective driving habits:

  • Look well ahead at the traffic to pick out the clues that indicate speed changes and stops developing in the traffic pattern.
  • Look ahead for traffic control devices to anticipate light changes before reaching the intersection. Traffic lights that have been green for some time before you reach the intersection are probably stale and could change at any time. Streets with synchronized lights permit you to adjust your speed to the traffic lights.
  • Maintain an adequate following distance from the vehicles ahead so that a smooth, gradual stop may be completed, even if the vehicle ahead has made a panic stop.

Following distance

Drivers of semi trailer units, trucks and buses sometimes drive in a caravan. That way, the first truck in line breaks the wind resistance for the trucks following close behind. This leaves insufficient stopping distance and prevents faster traffic from passing one truck at a time. Law prohibits this practice.

Time interval following distance

If you drive a taxi, ambulance, police vehicle or van, you should maintain a three-second interval between your vehicle and the vehicle ahead. Just what does this mean? It’s really quite simple if you follow these two steps:

  1. As the vehicle in front of you passes any stationary point of reference (for example, a patch of oil on the pavement, a power pole, a road sign, a bridge or overpass) count seconds - out loud at first - by simply saying "Thou - sand and one, Thou - sand and two, Thou - sand and three," etc.
  2. If the vehicle you are driving reaches the reference point you selected before "Thou - sand and three," you are following too closely. You should drop further back. If, however, you finished your count before you reach your point of reference, then your following distance is actually greater than required, giving you an extra safety cushion.

If you drive a power unit, semi trailer, bus, truck or truck and trailer, round out the length of the vehicle to the nearest metre and divide by three to determine your count.

Example: If your truck and trailer is 14.6 m, round to 15 m, then divide by three.

15/3 = 5-second count

When road conditions change because of rain, snow or ice, lengthen the count to suit the changing conditions.

Space must be allowed for other vehicles to pull in between you and the vehicle ahead.

A short observation of the driving technique of the driver ahead will tip off the professional driver as to what might be expected. If the vehicle ahead is a tailgater, you can expect to have frequent "panic stops." The driver ahead who maintains a safe following distance usually has a longer, lighter brake application for stops, giving you adequate notice by their brake lights that they are slowing down.

Disclaimer

Rev: 2017