The new Dinan Way extension in Exmouth will open on 9 September as work begins on the final phase of the scheme.
But the next stage will mean some disruption for drivers for the rest of the year.
A short section of the A376 between Courtlands Cross and Courtlands Lane will close to through traffic while the roundabout is completed.
There will also be overnight closures at Courtlands Cross from 7pm to 6am on 7th and 8th September to allow preparatory work to be carried out.
The new 800-metre road will carry traffic in and out of Exmouth while the second new roundabout is finished at the A376 junction.
The diversion route will be fully signed, and more information will be available on the scheme webpage.
During the closure, vehicles travelling to and from Exmouth town centre will be diverted along the newly completed Dinan Way extension and Hulham Road.
The diversion route will include a number of temporary one-way routes.
These include routes between Hulham Road and Exeter Road via Iona Avenue; between Exeter Road and Hulham Road via Featherbed Lane; and between Pound Lane and Hulham Road via Forton Road/The Marles, Brixington Lane, Jubilee Drive and Dinan Way.
The one-way system, which will be shown in full on the scheme webpage, has been put in place to ensure that most residents can continue to park on the road during the work and to help keep congestion on Hulham Road to a minimum.
There will few parking restrictions but the ones in place will be outside Hulham Road stores and at the nearby junction with Exeter Road, where the road narrows.
There will also be parking restrictions on the A376 between Courtlands Lane junction and Rivermead Avenue. To facilitate footway widening works.
The new road will improve local journeys, support future housing at Goodmores Farm and provide a safer, more reliable route.
The A376 roundabout is one of the most difficult parts of the scheme and has been delayed because of the number of recorded underground utility services in the area that now require diversions.
Poor weather earlier in the year also meant earthworks could not be completed for several months, and the scheme has also been affected by supply chain issues.
The overall scheme is currently expected to be finished by the end of this year.
Temporary traffic lights will also be needed on parts of the A376 during the autumn while contractors move utility services and finish drainage, kerbs and footway work.
The project will also deliver a wider footway along part of the A376 to improve routes for pedestrians and cyclists.
Most of the new 800-metre road has already been built, including the Hulham Road roundabout, a six-metre-high retaining wall, drainage and ponds to manage surface water.
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