Child restraintsUnited Kingdom
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174. Child restraints
Child restraints are safety systems designed to protect children travelling in vehicles. They include rear-facing and forward-facing child seats and booster seats that position and restrain a child according to their size and the restraint system's specifications.
A child restraint should be suitable for the child and vehicle, installed according to the manufacturer's instructions and secured correctly on every journey. Rear-facing restraints must never be placed in front of an active frontal airbag.
Wikimedia.org • Pieter Kuiper • CC BY-SA
Until what age or height must a child normally use a car seat in Britain?
Children normally need an appropriate child car seat until their 12th birthday or until they reach 135 cm in height, whichever occurs first. After that they must use an adult seat belt where fitted.
🔗 gov.uk • UK Government — child car seats,135cm/12-year general rule and exceptions

Traffic rules
United Kingdom