The Department of Transport and the Police are reminding everyone of the vital importance of obeying the Mountain Road one-way system during the TT.

Director of Highways Bruce Hannay says it was introduced to improve safety, but can only work if everyone sticks to the rules and drives within the speed limits.

From Keppel Gate to the Creg ny Baa there's a descending speed limit, first 60mph then 40mph, to allow vehicles to stop at the temporary traffic lights just before the Creg.

The DoT says despite traffic only travelling in one direction, it's still illegal to cross the solid white lines as there are vehicles joining the road at the Bungalow and other junctions.

The Police are patrolling regularly to ensure the regulations are complied with.

The section of the Mountain Road from Ramsey Hairpin to the Creg ny Baa will remain one-way-in the direction of the TT Course, until 10am on Monday, June 9th.