The Institute of Advanced Motorists (IAM) has highlighted some of the worst speeding offences to have taken place in Scotland over the last 15 months.

Following a freedom of information request to Police Scotland, the organisation has been able to publish details of 20 of the most concerning incidents to have been recorded by the authorities, with one driver reaching 139 mph on a 60 mph road.

The offence was witnessed on the Keith to Huntly Road approximately one mile east of the B9115 junction in Aberdeenshire.

Just one of the top 20 largest speeding offences was shown to have taken place on a motorway in the last 15 months, with the remainder witnessed on A roads up and down the country.

Speeds of more than 100 mph were recorded in each of the cases, with each incident captured by either fixed or mobile speed cameras.

Responding to the results, IAM chief executive Simon Best said: "These speeds show there are still drivers out there displaying a contempt for the law and for the safety of their fellow road users.

"This is made doubly worse by the fact the vast majority of the incidents took place on A roads, therefore putting oncoming motorists, motorcyclists, cyclists and pedestrians at greater risk."

All drivers must obey the law when it comes to travelling at an appropriate speed. Failure to do so can result in serious and life-threatening accidents and this is something all road users need to be aware of every time they get behind the wheel of a vehicle.

The Royal Society for the Prevention of Accidents (RoSPA) believes increased levels of education are now required to reduce the likelihood of motorists breaking in the law in this manner, as the organisation's statistics show 14 per cent of all collisions resulting in an injury come about as a result of excessive speed.

Moreover, RoSPA's data reveals that in 24 per cent of cases where a fatality occurs, speeding is shown to be a contributory factor.