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DVSA revision material with source-checked Lanekind learning corrections. Lanekind is not a DVSA product and is not endorsed by the Driver and Vehicle Standards Agency. The Highway Code is Crown copyright, reproduced under the Open Government Licence.

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LanekindThe Highway CodeRules for drivers and motorcyclistsRule 91

Rules for drivers and motorcyclists · Fitness to drive

Rule 91: Driving when you are tired greatly increases your risk of collision

Driving when you are tired greatly increases your risk of collision. To minimise this risk

make sure you are fit to drive. Do not begin a journey if you are tired. Get sufficient sleep before embarking on a long journey
avoid undertaking long journeys between midnight and 6 am, when natural alertness is at a minimum
plan your journey to take sufficient breaks. A minimum break of at least 15 minutes after every two hours of driving is recommended
if you feel sleepy, stop in a safe place. Do not stop in an emergency area or on a hard shoulder of a motorway (see Rule 262 for guidance on places to take a break when travelling on motorways).

Source note (app): Rule 91 refreshed from the Department for Transport’s GOV.UK Highway Code, checked 2026-09-05. This corrects the imported passage only; the rest of the archive has not been refreshed. © Crown copyright. Contains public sector information licensed under the Open Government Licence v3.0. Licence details: The National Archives, Open Government Licence v3.0. No government endorsement is implied.

In the Highway Code, MUST and MUST NOT identify legal requirements. Advice using should, should not, do or do not can still be used as evidence in court proceedings under the Traffic Acts to establish liability. The introduction explains this distinction.

The rules either side

The Code reads in order, and each of these names the rule it goes to rather than saying only ‘next’.

Rule 90: Make sure that you are fit to driveThe rule before this one Rule 92: VisionThe rule after this one

Fitness to drive

5 rules

The rules the Code files beside this one, in its order.

Rule 90: Make sure that you are fit to driveYou MUST report to the Driver and Vehicle Licensing Agency (DVLA) any health condition likely to affect your driving.Rule 91: Driving when you are tired greatly increases your risk of collisionTo minimise this risk make sure you are fit to drive. Do not begin a journey if you are tired.Rule 92: VisionYou MUST be able to read a vehicle number plate, in good daylight, from a distance of 20 metres (or 20.5 metres where…Rule 93: Slow down, and if necessary stop, if you are dazzled by bright sunlightSlow down, and if necessary stop, if you are dazzled by bright sunlight.Rule 94: At night or in poor visibilitydo not use tinted glasses, lenses or visors if they restrict your vision.

Rules for drivers and motorcyclists

Rules 89 to 102

The other groups in this part of the Code, and the rest of it.

Vehicle condition (rule 89)1 rule Fitness to drive5 rules Alcohol and drugs2 rules Before setting off (rule 97)1 rule Vehicle towing and loading (rule 98)1 rule Seat belts and child restraints4 rules

All of Rules for drivers and motorcyclistsRules 89 to 102 on one page Road signs and markingsEvery sign this rule refers to, each one on a page you can link to.