THE installation of average speed cameras on the A9 has been delayed until October and they will not now cover dual carriageway sections north of Perth, The Scotsman has learned.
The £2.5 million system had been due to be completed this summer with the first cameras in place early this year.
It was also planned to cover the entire 136 miles between Dunblane and Inverness, in an attempt to cut the number of crashes before the road is upgraded to dual carriageway in 2025.
However, the scheme will now be built in eight separate sections, covering the seven single carriageway stretches north of Perth, and the dual carriageway stretch south from Perth to Dunblane.
Each stretch will be clearly marked with signs, with cameras sited every three to four miles within each stretch so drivers won’t know between which cameras their speed is being measured.
The speed limit for cars is 60mph on single carriageway sections and 70mph on dual carriageways.
There is also doubt over whether cameras on the Dunblane-Perth section will be delayed further by roadworks in the area being suspended for the Ryder Cup at Gleneagles in September.
Cameras on that section will focus on protecting junctions, such as at Auchterarder and Aberuthven.
When transport minister Keith Brown announced the cameras last July he said: “We hope to see the first of the cameras introduced early next year and expect the system to be fully operational in the Summer of 2014.”
The switch-on will be accompanied by a trial to raise the lorry speed limit on single carriageway sections between Perth and Inverness from 40mph to 50mph.
Police vehicles will continue to enforce the speed limit on dual carriageway sections north of Perth.
It is understood that technical difficulties have led the decision not to site cameras on these stretches too.
Meanwhile, a campaign to educate motorists about safe overtaking is to be launched next week.