100. The driver MUST   ensure that all children under 14 years of age in  cars, vans and other goods vehicles wear seat belts or sit in an  highwaycodeuk.co.uk 49  Seat Belt  Requirements  Front seat  Rear seat  Who is  responsible?  Driver Seat belt MUST be worn if fitted Driver Child under 3 years of age Correct child restraint MUST be used Correct child restraint MUST   be used. If one is not available in a taxi, may travel unrestrained. Driver Child from 3rd birthday up to 1.35 metres in height (or 12th birthday, whichever they reach first) Correct child restraint MUST be used Correct child restraint MUST   be used where seat belts fitted. MUST use adult belt if correct child restraint is not available in a licensed taxi or private hire vehicle, or for reasons of unexpected necessity over a short distance, or if two occupied restraints prevent fitment of a third. Driver Child over 1.35 metres (approx 4ft 5ins) in height or 12 or 13 years Adult seat belt MUST be worn if available Adult seat belt MUST   be worn if available Driver Adult passengers aged 14 and over Seat belt MUST be worn if available Seat belt MUST   be worn if available Passenger