These Regulations make provision for variable speed limits on various sections of the road known as the A823(M) Pitreavie Spur Trunk Road.

Regulation 3 provides for variable speed limits to have effect on the sections of that road specified in the Schedule. Where variable speed limit signs are in operation a vehicle may not be driven at a speed above the maximum indicated by each speed limit sign passed by the vehicle. Where a speed limit sign changes 10 seconds or less before a vehicle passes the sign and the sign had indicated a higher speed limit, the regulation allows a driver to proceed at a speed up to the maximum applicable before the change. Where the speed limit sign indicates a speed limit when it is passed by the vehicle but 10 seconds before it was not indicating any speed limit the sign is to be taken as not indicating any speed limit to that vehicle. In this instance the variable speed limit provisions will not apply and the default maximum speed will be 70 miles per hour as provided for by the Motorways Traffic (Speed Limit) Regulations 1974.

Contravention of the Regulations is an offence under section 17(4) of the Road Traffic Regulation Act 1984.