A new all-Wales campaign to educate young people about the dangers of driving too fast is being launched.
The campaign will see dedicated police patrols target young drivers
The Deadly Mates campaign will see traffic officers stopping young drivers and handing out promotional material.
One in four car drivers killed or seriously injured in crashes in Wales is under 25, say police.
The most dangerous drivers are young men with passengers because they drive for the thrill of it and to "show off", said a road safety scheme spokesman.
Gwent Police will run the two-week campaign for the three other forces in Wales and the Mid and South Wales Safety Camera Partnership.
The campaign has a website and dedicated police road patrols will target young drivers.
YOUNG DRIVER FACTS
One in five new drivers has an accident within the first 12 months of passing their test
New drivers are involved in 29% of all road crashes
One in four car drivers killed or seriously injured in the UK is under 25
Drivers aged 17-19 are six times more likely to have a drink-drive crash than drivers aged 30-34
25% of passengers admit to pressing on an imaginary foot brake
More than 1000 young lives are lost every year in road crashes
Source: TNS market research survey
It will also run alongside the all-Wales anti-drink drive campaign which began on 3 December.
Insp Lee Ford of Gwent Police's Roads Policing Unit said young drivers had more accidents than anyone else and the aim was to make them think of the consequences of their actions.
"They are responsible for around one in five of all the accidents where someone is killed or seriously injured.
'Thrill of it'
"There appears to be a very cavalier attitude to safety amongst some young drivers where they do not value or understand good driving skills. "
Jim Moore of the Mid and South Wales Safety Camera Partnership said the most dangerous drivers were most likely to be new, with little or no experience.
"Their friends put pressure on them to take risks at the wheel for a laugh or they race other cars which is stupid and really dangerous," said Mr Moore.
"Making sharp risky driving moves at speed or driving too close behind other cars is really dangerous as they won't be able to brake in time if, for example, a child runs into the road," he said.
"The most dangerous people behind the wheel are young men with passengers - because they drive faster for the thrill of it and to show off."