The latest A9 safety figures show that average speed cameras have helped to reduce fatal and serious casualties by almost 37%.
The figures now bring together evidence from the first 30 months of the action on the route between Dunblane and Inverness.
Compiled by the A9 safety group, they are said to show a sustained improvement in driver behaviour.
They also show a longer-term trend of reduced collisions and casualties, with the number of ‘fatal and serious’ collisions between Dunblane and Inverness down by 32%.
Meanwhile, motorists should expect delays as “essential investigation works” get under way on a dualled section of the A9 at Killiecrankie.
They will take place on the retaining walls next to the carriageway and involve carrying out an inspection and testing of the wall support systems to check the structures remain safe and secure into the future.
The project starts on Monday September 18 and is scheduled to take two weeks during which time the A9 will require temporary lane closures on both the northbound and southbound carriageways.
BEAR Scotland’s Edie Ross said: “The lane closures are essential to make sure that everyone is kept safe during the investigations.
“Our teams will look to complete the works as quickly and safely as possible.”