Work begins on 1st August on a 13-month scheme costing almost £6m to convert Wraxall Road roundabout at Warmley into a fully signal-controlled ‘throughabout’.
It will be the first of its kind in South Gloucestershire, but the council says it is similar to other successful models elsewhere in the country and abroad.
The roundabout on the A4174 Avon Ring Road, also known locally as Woodstock roundabout, currently experiences congestion during the busiest hours on weekdays, with queuing causing delays to both ring road traffic and also vehicles entering from Tower Lane and Wraxall Road, including local bus services.
The improvements aim to reduce congestion on all approaches to the roundabout, and futureproof to 2036, by which time planned growth in housing and jobs will see higher levels of traffic, The scheme also aims to reduce the number of collisions at what is an accident blackspot, as well as improve air quality.
Works will include widening approaches to the roundabout to three lanes of traffic; installing new traffic signals on the approaches and in the throughabout; creating three lanes of traffic in each direction through the roundabout; and removing some vegetation on verges to create the extra lanes.
The first road closures are taking place overnight between Saturday 1st August and Friday 7th August from 8pm to 6am so the first stage of the temporary traffic management can be set up. The diversion route will be via the A420, A4320 St Philips Causeway, A4 Bath Road, A4174 ring road, and vice versa.
The cost is being funded by the West of England Combined Authority (WECA) and Local Enterprise Partnership. South Gloucestershire Council is doing the work, using specialist sub-contractors where required.
The council says it will monitor traffic in the area during the construction phase and, if some areas experience severe difficulties, it will consider implementing additional measures to help ease congestion.
For the majority of the construction programme cyclists and pedestrians will be unaffected.