A new law which makes it compulsory for people to wear seatbelts in the back of cars, vans and minibuses is to come into force in Jersey.
Motorists and passengers currently have to wear a seatbelt in front seats and it is a legal requirement for children under 14 to belt up in the back.
States members agreed to the new law in March 2008. It will bring the island in line with the rest of Europe.
Those who flout the law, which comes into force on Friday, face a £50 fine.
Philip Blake, from the Road Safety Panel, said: "In Jersey, on average, every three years at least one person has been killed in the rear of a vehicle who wasn't wearing a seatbelt.
"Many others who didn't wear a seat belt have been seriously injured.
"Making everyone wear a seat belt will reduce the risk of serious injury for those involved in crashes."
Cars and dual-purpose vehicles, such as vans with seats in the back, which have been registered after April 1987 must have rear seat belts fitted.
Minibuses manufactured since October 2001 have seat belts fitted for all passengers and many minibuses built before then also have seat belts.
Connétable Mike Jackson, the Minister for Transport and Technical Services, said: "From 3 April, everyone, adults and children, will have to belt up in the back of vehicles.
"We must wear a seat belt when travelling in these vehicles or we will be committing an offence subject to a fine of £50".