The A9 between Dunblane and Perth will have road closures and lane closures implemented along the route for three months as work begins to remove diseased trees.
Amey is undertaking essential woodland management to remove trees affected by Ash Dieback at multiple sites between Keir Roundabout and Broxden Roundabout.
The £200,000 works will take place from Wednesday, December 4, to Thursday, March 13, under day and night shifts from 9.30am to 3.30pm and 7.30pm to 6.30am.
To ensure the safety of roadworkers and motorists the scheme will be undertaken under a mixture of road closures, near side lane closures, off side lane closures and off slip closures.
There will be two separate road closures on the A9 from Tuesday, February 25, to Friday, February 28, and from Monday, March 3, to Saturday, March 8.
From Tuesday, February 25, to Friday, February 28, 1km northbound from Shell at Balhaldie to the A822 on-slip onto the A9 southbound will be closed from 7.30pm to 6.30am each night.
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The following diversion will be in place during the closure. Traffic will come off at Gleneagles and up over to Crieff using the A823 and A822. Traffic can then use the A85 to travel west towards the A84, taking the A84 south down to Craigforth Interchange at Stirling where they can access the M9 to travel north.
From Monday, March 3, to Saturday, March 8, the A9 between Auchinlay Road and where the A9 passes over the rail bridge north bound from Auchinlay road near Allan Water will be closed from 7.30pm to 6.30am each night.
For a diversion route, traffic can come off the A9 at the Scouring Burn onto the B8033, using the B8033 through Dunblane to either use Keir Roundabout to travel back north on the A9 or to join the A820.
Further traffic management for the rest of this scheme will be undertaken under single lane closures and one off slip closures.
The scheme, which Amey is undertaking on behalf of Transport Scotland, will overall improve safety for road users, especially within the coming winter months.