Skip to content
Highway Code · Rule 126

Highway Code Rule 126

General rules, techniques and advice for all drivers and riders (103 to 158). Advisory guidance you are expected to follow.

  • General rules, techniques and advice for all drivers and riders
  • Advisory rule
  • OGL v3.0

What the rule says

Advisory

Rule 126 (Control of the vehicle (rules 117 to 126)) Download ‘Typical stopping distances’ (PDF, 124KB) Stopping distances. Drive at a speed that will allow you to stop well within the distance you can see to be clear. You should

  • leave enough space between you and the vehicle in front so that you can pull up safely if it suddenly slows down or stops. The safe rule is never to get closer than the overall stopping distance (see Typical Stopping Distances diagram)
  • allow at least a two-second gap between you and the vehicle in front on high-speed roads and in tunnels where visibility is reduced. The gap should be at least doubled on wet roads and up to ten times greater on icy roads
  • remember, large vehicles and motorcycles need a greater distance to stop. If driving a large vehicle in a tunnel, you should allow a four-second gap between you and the vehicle in front If you have to stop in a tunnel, leave at least a 5-metre gap between you and the vehicle in front. Rule 126: Use a fixed point such as a sign to help measure a two-second gap Tailgating is where the gap between you and the vehicle in front is too small for you to be able to stop safely if the vehicle in front suddenly brakes. Tailgating is dangerous, intimidating and can cause collisions, especially when driving at speed. Keeping a safe distance from the vehicle in front gives you time to react and stop if necessary. Dangerous and careless driving offences, such as tailgating, are enforced by the police.

Rule text reproduced verbatim from the official Highway Code (Crown copyright) under the Open Government Licence v3.0, see the attribution at the foot of this page.

In plain English

Stripped of the formal wording, Rule 126 comes down to one idea: rule 126 (Control of the vehicle (rules 117 to 126)) Download ‘Typical stopping distances’ (PDF, 124KB) Stopping distances. It is advice rather than law, but examiners and the courts still treat it as the expected standard of safe driving.

It belongs to the general rules, techniques and advice for all drivers and riders part of the Code, the habits a confident, considerate driver builds until they are automatic. The aim is not to memorise the sentence word for word, but to understand the hazard it protects you from, so you apply it without having to think when it counts.

If you are learning, treat this rule as one piece of a connected set rather than an isolated fact. The related rules below sit in the same section and reinforce each other, reading them together is how the general rules, techniques and advice for all drivers and riders part of the Code starts to feel like common sense rather than a list to revise.

Because this is advisory rather than legal, no one will fine you for the rule alone, but ignoring it can still count against you in a careless-driving case, and it will cost you faults on the test. Either way, the safe move is to build the habit early, while a driving instructor can correct it, rather than relearning it under test pressure. That is exactly what the practice routes and coaching in the DriveRoutes app are designed to help with, turning the rules below into the way you naturally drive.

Why rule 126 matters on the road

These are the foundations every other skill builds on. Solid mirror work, sensible speed and good lighting habits quietly prevent the situations the rest of the Code has to deal with.

Common faults examiners record

In the general rules, techniques and advice for all drivers and riders part of the Code, the faults most often written on the marking sheet tend to be the same handful. Knowing them in advance is the quickest way to drive them out of your own habits:

  • Skipping or rushing mirror checks before a manoeuvre.
  • Carrying an unsuitable speed for the road and conditions.
  • Reacting late because hazards were spotted too close.

On the day

On the day, applying Rule 126 is about doing the safe, deliberate thing slightly earlier than feels necessary: read the situation in good time, observe fully, and act smoothly. The examiner is looking for planned driving, not perfection, and good habits formed in lessons carry you through.

Quick checklist

  • Read the situation early and plan your response.
  • Observe fully before you commit to anything.
  • Keep your speed suitable for the road and conditions.

More from General rules, techniques and advice for all drivers and riders

Related Highway Code rules

Rule 126, your questions

Rule 126 (Control of the vehicle (rules 117 to 126)) Download ‘Typical stopping distances’ (PDF, 124KB) Stopping distances. It is advisory guidance rather than law, but you are still expected to follow it and an examiner can mark a fault if you do not.

DriveRoutes is an independent study aid and is not affiliated with, endorsed by, or connected to the Driver and Vehicle Standards Agency (DVSA).