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:

Road Rage

Avoiding distractions while driving

Brakes/Braking and Road Safety

Safe Driving at night

Loading...

Search Road Safety Articles

Latest Pages

Safe Driving in Heavy Traffic

Safe Driving in Heavy Traffic

Introduction As urbanisation drives many to the cities and vehicle ownership increases, road users have to prepare themselves with the skills and attitude required to drive in heavy traffic much more often. Heavy traffic could be caused by numerous factors including: Usual rush-hour /

Read More

Road Safety Tips for the Festive Season from ArriveAlive.co.za

Road Safety Tips for the Festive Season from ArriveAlive.co.za

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

Scholar Patrol Awareness With Syntell

Scholar Patrol Awareness With Syntell

Scholar Patrol Awareness The Department of Community Safety, Johannesburg Metro Police Department (JMPD) and other stakeholders including Syntell come together, on an annual basis, to draw awareness to the importance of Scholar Patrol within our Johannesburg region schools. The function, which

Read More

Hijack Prevention Guidelines

Hijack Prevention Guidelines

Introduction: It has become increasingly difficult to steal motor vehicles, with all the anti-theft devices, such as immobilisers, gear-locks, etc. These steps have resulted in a dramatic increase in vehicle hijackings. The hijacker has the element of surprise and this is a concern. The increasing

Read More

Protecting Yourself against Hijackings

Protecting Yourself against Hijackings

Amidst the increase in hijackings in South Africa, it is very important to know some of the following aspects: How do the hijackers operate? When am I most at risk? How do I avoid being hijacked? What do I do when confronted? How to Avoid a Hijack Situation Sterling work has been

Read More

Hijacking and Road Safety

Hijacking and Road Safety

Hijacking in South Africa Carjackings between April 2005 and March 2006 = 12,825 Truck Hijackings between April 2005 and March 2006 = 829 The SAPS Strategic Plan (2004 – 2007) includes four key strategic priorities for the medium term. One of these is to: combat organised crime

Read More

Load More Pages

Partners

View All