BCP Council is carrying out works on the A338 Wessex Way in Bournemouth from Monday 14 November to enable future maintenance works on the Braidley Road Overbridge.
The works will require a single-lane closure on both sides of the carriageway between Bournemouth West Roundabout and St Pauls Roundabout for approximately three weeks.
In addition, there will be a 30mph speed limit and the Eastbound Richmond Hill Interchange off slip will be closed with traffic diverted to Bournemouth West Roundabout.
Works involve the construction of two crossover points through the central reservation to allow for future work.
Julian McLaughlin, BCP Service Director, Transport and Engineering, said: “The Wessex Way opened in 1970 and is one of the main arterial routes linking our three towns. We need to make sure it is properly maintained and remains safe for years to come.
“Following recent inspections, we’ve identified the need to replace the expansion joints together with other maintenance works on the Braidley Road Overbridge. To be able to do this safely and keep the road open, we need to install two crossover points.’’
“We appreciate that this will lead to some disruption to journeys and would therefore advise people to avoid travelling at peak times, use alternative routes or consider walking and cycling where possible.”