Speeding accounted for four in five driving offences in North Wales last year, figures reveal.

The transport research charity RAC Foundation says the simple rule for drivers who want to avoid a speeding ticket is to stay within the limit.

Analysis of Home Office data by the group shows that motorists were caught driving too fast 19,493 times by North Wales Police in 2018-19.

It means 79% of the 24,610 motoring offences recorded over the period were for speeding.

This was a lower proportion than across England and Wales as a whole – 84% of the 2.8 million motoring infractions logged across the two nations were for speeding.

Steve Gooding of the RAC Foundation said: “The simple rule for drivers who don’t want to risk ending up with a speeding ticket is not to break the limit in the first place.

“Where limits are properly signposted, and clearly feel right for the road in question, then motorists have no excuse for going faster.

“But that means highway authorities also have a responsibility to make sure the limits they set are appropriate and to avoid instances where the limit repeatedly bounces up and down along a single stretch.”

The number of speeding offences detected in North Wales in 2018-19 was 5% lower than during the previous year, but 67% more than in 2011-12.

Across England and Wales, the 2.4 million offences recorded in 2018-19 represented a 4% annual increase, and a 37% rise compared with seven years previously.

In North Wales, 83% of speeding offences in 2018-19 were dealt with by handing the driver a fine.

The next most common outcome was court action (14%), while 2% resulted in a speed awareness course and 1% of offences were cancelled.

The analysis, which was carried out with Liverpool John Moores University, found that the number of drivers caught speeding varied widely across England and Wales.

The police force that detected the most speeding offences in 2018-19 was West Yorkshire with 182,000.

But in Wiltshire, where all speed cameras were turned off in 2010, the police caught fewer than 1,000 people speeding.

Researchers suggested the disparity is partly due to road type, traffic volume and local policing priorities.

Department for Transport figures show 186 people were killed and 1,505 seriously injured in crashes on Britain's roads in 2018 in which a vehicle exceeding the speed limit was a contributory factor.