Bicycle helmetUnited Kingdom
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181. Bicycle helmet
Abicycle helmet is protective headgear designed to reduce the risk and severity of head injuries if a cyclist falls or is involved in a collision. It normally consists of an impact-absorbing liner, an outer shell and a retention strap that keeps the helmet securely on the head.
A bicycle helmet should fit correctly, sit level on the head and be securely fastened. A damaged helmet should be replaced because its protective performance may have been reduced even when the damage is not immediately visible.
Wikimedia.org • Ildar Sagdejev • CC BY-SA
Is a cycle helmet legally compulsory for ordinary cycling in Great Britain?
The Highway Code strongly recommends a correctly fitting helmet, but its use is not a general statutory requirement for ordinary adult cycling in Great Britain. This is different from the compulsory motorcycle-helmet rule.
🔗 gov.uk • Highway Code for Great Britain — Rule59, recommended bicycle helmet

Traffic rules
United Kingdom