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Following Distance, Tailgating & Space Management

Space around your car is your safety margin. Learn the two-second rule, stopping distances, and why tailgating is dangerous.

The full guide

Maintaining a safe following distance is one of the most important skills for safe driving. The examiner is constantly checking whether you leave enough space between your car and the vehicle ahead, and whether you adjust that space for speed, weather, and road conditions.

The two-second rule is the standard guide for dry conditions. Pick a fixed point that the car ahead passes, then count two seconds before you pass it. If you reach it before two seconds, you are too close. In wet conditions, double this to four seconds. In icy or foggy conditions, you may need ten seconds or more.

Tailgating — driving too close to the vehicle in front — is dangerous and illegal. It removes your reaction time and space, increases the risk of a collision, and intimidates the driver ahead. If you are being tailgated, do not brake suddenly. Instead, ease off the accelerator slightly to increase the gap in front of you, giving yourself more room to react if the traffic ahead slows.

Stopping distances increase dramatically with speed. At 20 mph, the thinking distance is 6 metres and the braking distance is 6 metres, giving a total of 12 metres. At 30 mph, the total is 23 metres. At 50 mph, it is 53 metres. At 70 mph, it is 96 metres. These figures are for dry conditions — wet, icy, or worn tyres can double or treble them.

Large vehicles such as lorries and buses need more stopping distance and have larger blind spots. Do not cut in front of them after overtaking — they may not be able to stop in time. Give them extra space and patience, especially on hills and at junctions.

In heavy traffic, resist the urge to close the gap. Stop-start traffic encourages drivers to bunch up, but this increases the risk of low-speed collisions and makes it harder to react to sudden changes. Maintain a safe gap even in queues, and be prepared for the vehicle ahead to brake unexpectedly.

Common faults

  • Driving too close to the vehicle in front — tailgating
  • Not increasing following distance in wet or poor weather conditions
  • Not adjusting following distance for speed
  • Cutting in front of large vehicles after overtaking
  • Braking suddenly when being tailgated
  • Not maintaining a safe gap in heavy traffic queues
  • Underestimating stopping distances at higher speeds

What the examiner looks for

  • You maintain at least a two-second gap in dry conditions
  • You increase the gap in wet, foggy, or icy conditions
  • You adjust your following distance for speed and road conditions
  • You do not tailgate or pressure the driver in front
  • You give large vehicles extra space and do not cut in front of them
  • You stay calm and increase your own safety gap if being tailgated

Quick tips

  1. 1Use the two-second rule in dry conditions — pick a fixed point and count
  2. 2Double your following distance in wet weather
  3. 3At 70 mph your stopping distance is 96 metres — about 24 car lengths
  4. 4If being tailgated, ease off the accelerator to increase your own safety cushion
  5. 5Never cut in front of a lorry or bus — they need far more space to stop

Common questions about following distance, tailgating & space management

What is the two-second rule?
The two-second rule is a guide for safe following distance in dry conditions. Pick a fixed point that the car ahead passes, then count two seconds before you pass it. If you reach it sooner, you are too close. In wet conditions, double this to four seconds.
How does speed affect stopping distance?
Stopping distance increases dramatically with speed. At 20 mph the total stopping distance is 12 metres. At 30 mph it is 23 metres. At 50 mph it is 53 metres. At 70 mph it is 96 metres. These figures are for dry conditions. Wet, icy, or worn tyres can double or treble them.
What should I do if someone is tailgating me?
Do not brake suddenly — this can cause a collision. Instead, ease off the accelerator slightly to increase the gap in front of you. This gives you more time to react if the traffic ahead slows. If safe, pull into a slower lane or a lay-by to let them pass.
Why should I give large vehicles more space?
Large vehicles such as lorries and buses need more stopping distance because they are heavier. They also have larger blind spots. Never cut in front of them after overtaking — they may not be able to stop in time. Give them extra room and patience.
Should I maintain a gap in heavy traffic?
Yes. Even in slow-moving or stop-start traffic, maintain a safe gap from the vehicle ahead. This reduces the risk of low-speed collisions and gives you room to react if the vehicle ahead brakes suddenly. Resist the urge to bunch up.
What is the stopping distance in wet conditions?
In wet conditions, stopping distances are roughly double those in dry conditions. At 30 mph, the dry stopping distance is 23 metres, but in wet conditions it is at least 36 metres. At higher speeds, the difference is even greater. Always increase your following distance in wet weather.

Ready to put this into practice?

These guides are a great starting point, but nothing replaces working with a DVSA-approved instructor who can give you real-time feedback.

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Following Distance, Tailgating & Space Management | The DTC