Figures show that the number of under-age car drivers involved in crashes on Britain's roads has reached the highest level in four years.

Some 91 boys and girls under 17 years old were behind the wheel during accidents last year, according to Press Association analysis of Department for Transport data. This is 30% more when compared to the previous year, and is the most since 103 were recorded in 2011.

Separate analysis the RAC Foundation found that more than half (49) of the under-age drivers involved in crashes last year were injured, including one who was killed and 11 seriously hurt. The accidents also caused 48 passenger and pedestrian casualties, including two who were killed and eight who were seriously injured.

The minimum age for driving a car in Britain is 17.

RAC Foundation director Steve Gooding said: " Anyone who thinks of driving below the legal age limit as joy riding should think again.

"Not only are under-age drivers a massive risk to themselves, last year they also caused the death or injury of at least 48 other people. That's an unacceptable human toll for those directly involved, while the resulting financial costs then fall on motorists legally on the roads through having to meet higher insurance premiums."

AA president Edmund King warned that those involved should only be driving in computer games or at specialist off-road centres.

He said: "These children should be playing Gran Turismo or attending under 17s car clubs rather than crashing illegally on the real highway. A proportion are likely to be involved in car crime and others may have chanced taking their parents' car for a spin. Either way, they are breaking the law and putting their own and other lives at risk."

The number of crashes featuring under-age motorcycle riders has reached the joint highest level since current DfT records began five years ago. There were 48 accidents involving riders aged under 16 in 2015, up 37% on the year before.

Almost nine out of 10 (42) of the youngsters were injured, including 19 seriously. The accidents resulted in 12 passenger and pedestrian casualties, including six who were seriously injured. The minimum age for obtaining a licence to ride a moped is 16.