Airbags alone are not enough to safeguard against serious injury to car occupants in the case of an accident, say German experts.
"Only by wearing a seatbelt are driver and front-seat passenger protected against being thrown at the dashboard or the windscreen," said Christian Buric of Germany's largest car club, the ADAC.
Airbags often don't operate at low speeds of up to 30km/h, according to two sets of tests carried out by the club at 30km/h and 64km/h.
ADAC research shows that one in five fatally injured car occupants was not wearing a seatbelt. The majority of those killed would still be alive if they had been wearing a seatbelt, said the club. About 98 per cent of motorists in Germany regularly wear a seatbelt while driving.