IT is billed as one of the fatal five - the offences that cause most deaths on the roads.
Yet more than 1,500 people have been found by police not to be wearing a seatbelt.
The figures were revealed after a police campaign across Wales last month – and did not make good reading.
"Last month over 1,500 people in Wales chose not to wear a seatbelt whilst travelling," said a campaign spokesman.
All four Welsh forces took part in the two week campaign and South Wales Police and Dyfed-Powys Police reported the worst figures.
In South Wales 260 adults and four children — under 14s — were caught not wearing a seatbelt.
In Dyfed-Powys 1,027 adults and 12 children were caught.
The equivalent figures in Gwent were 78 adults and two children, and in North Wales were 141 adults and 0.
Overall there were 1,524 offenders, including 18 children.
Police call not wearing a seatbelt one of the fatal five causes of the most road deaths, along with careless driving, speeding, drink driving, and driving while on a mobile phone. Drivers or passengers — including those in the back seat — who fail to wear seatbelts could face an on the spot fine of £100 and a maximum fine of £500 if prosecuted.
Officers pointed out the folly of not complying with the law.
Spokesman Superintendent Paul Evans, of Gwent Police roads policing unit, said: "This campaign identified a significant number of motorists and passengers in Wales who continue to ignore this simple road safety law and as a result put their lives at risk.
"The action of putting on a seatbelt takes seconds, and its effectiveness should not be underestimated. Even on a short trip and at low speed a seatbelt reduces the likelihood of being seriously injured or even killed on the road, it should be part of every person's routine before the ignition is turned on."
A similar campaign was held last year when the figures were slightly up.
Then 1,775 people in Wales were found not to be wearing seatbelts, including 405 in South Wales and 959 in Dyfed-Powys.