Arrive Alive

Following Distances and Road Crashes

Following Distances

The Dangers of Tailgating / Insufficient Following Distances

Most rear-end collisions are caused when drivers do not obey sufficient following distances. This is also known as Tailgating- often regarded as a form of aggressive driving behaviour. In South Africa, with the high prevalence of road rage, tailgating might contribute towards retaliation by other drivers and initiate instances of road rage.

Adequate following distances enable drivers to adjust in emergency situations and bring their vehicles to a stop safely – time that could mean the difference between life and death.

Total stopping distance involves the following:

  • Human perception time: The time required for a driver to recognise a potential hazard. This time is assumed to be approximately 0.75 seconds in normal situations
  • Human reaction time: Once the hazard has been perceived, the driver must respond by applying the brakes. The average reaction time is about 0.75 seconds
  • Vehicle reaction time: This is the time it takes for the vehicle to react once the brakes have been applied by the driver. Vehicle reaction time is very quick, usually assumed to be about 0.05 seconds.
  • Vehicle braking capability. This refers to the vehicle’s ability to come to a complete stop once the brakes have been applied

International studies have indicated that when a driver follows another vehicle at 100 kilometres per hour and the vehicle in front suddenly applies the brakes, the driver following will need about one and a half seconds to react. If there is not enough distance between the vehicles – the driver following would not be able to stop.

A driver should stay alert at all times as abrupt stopping could be caused by a variety of unforeseen events such as:

  • debris on the road
  • pedestrians or stray animals 
  • other drivers falling asleep, drunk drivers or drivers swerving across the road to evade hazards
  • drivers being distracted, i.e. answering cellular telephone calls etc

The 2-3 Second Rule

Most International road safety campaigns refer to the “2" or "3" Second Rule” as a guideline for safe following distances. A point on the road is noted, 2-3 seconds are counted, and if that point is still visible then there's probably enough following distance.

We agree with the National Safety Council that a three-second rule -- with increases of one second per factor of driving difficulty -- is more appropriate

The 2-3 Second Rule is applied as follows: 

  • Watch the vehicle in front of you pass a landmark - such as a sign, tree, or power pole - at the side of the road.
  • As it passes the landmark, start counting "one thousand and one, one thousand and two, one thousand and three".
  • If you pass the landmark before you finish saying all these words, you are following too closely. Slow down, pick another landmark and repeat the words, to make sure you have increased your following distance.
    This rule will ensure that you keep the correct following distance, no matter what speed you are travelling at.

Adjusting Following Distance

The 2-3 Second Rule is only the advised measure when driving conditions are ideal. This should be seen as a bare minimum and should be adjusted to at least 5-6 Seconds in the following situations:

  • In adverse weather conditions
  • Driving on slippery roads
  • Driving at night
  • When following vehicles with different characteristics, i.e. motorcycles & trucks
  • When towing a trailer or other object

Avoiding Tailgaters

Always drive defensively and focus on your safety and the safety of those around you. Don't allow yourself to be tailgated—change lanes or adjust your speed to encourage tailgaters to pass you.

If someone cuts into your space, take a deep breath, simply back off a little and regain enough space –what counts is your safety!

Also, visit the following sections:

Safe Following Distances and Road Safety

Road Rage

Avoiding distractions while driving

Brakes/Braking and Road Safety

Safe Driving at night

Loading...

Search Road Safety Articles

Latest Pages

SpeedFOX and Road Safety

SpeedFOX and Road Safety

Intelligent Speed Assist (ISA) technology that is so evolved it provides predictable, real-time, location-aware speed control that saves your business time and money. Speed Control at The Pedal SpeedFOX intelligently assists drivers to comply with speed regulations in varying road conditions through

Read More

E-Hailing Taxi Services and Road Safety

E-Hailing Taxi Services and Road Safety

Introduction Technology and smartphone apps have changed the way most of us gain access to taxi services. The E-Hailing taxi services industry has become a major role player in public transport. Even though it is very convenient, mostly well-regulated and safe, the E-Hailing taxi industry has also

Read More

ABC of Accident and Crash Investigation

ABC of Accident and Crash Investigation

Stanley Bezuidenhout is an internationally experienced crash investigator, crime scene analyst, court expert, author, trainer, and public speaker. He has committed more than 20 years of his extensive career to crash investigation and expert services in many countries, including the SADC Region of Africa,

Read More

Road Safety Tips for the Festive Season

Road Safety Tips for the Festive Season

Obey the rules of the road and carry your driver’s license with you. Plan the route to your holiday destination and allow yourself enough time to reach the destination Make sure that your vehicle is in a roadworthy condition before departure. All lights and indicators, windscreens, windscreen

Read More

Advanced Driving, Defensive Driving and Road Safety

Advanced Driving, Defensive Driving and Road Safety

Definition and Background Advanced Driving has been described as: “The ability to control the position and speed of the vehicle safely, systematically and smoothly, using road and traffic conditions to make reasonable progress unobtrusively, with skill and responsibility. The skill requires

Read More

Automotive Glass and Its Role in Vehicle Safety - The Second Edition

Automotive Glass and Its Role in Vehicle Safety - The Second Edition

In a previous analysis, we said that there’s more to a modern windscreen than meets the eye. A windscreen today is a core component that forms part of the structural frame and integrity of your vehicle, which will help prevent the roof from collapsing or caving in should the vehicle be overturned

Read More

Load More Pages

Partners

View All