A handful of key roads are due to close as a project to widen the roundabout at an M4 junction ramps up.

Roadworks have been in place at junction 17 of the M4, north of Chippenham, since January while contractors MJ Church carry out improvements to the roundabout, on behalf of St Mowden Logistics.

The works include a scheme to widen the roundabout, ahead of the completion of up to 1,000,000sq feet of employment space at the Mowden Park Site, less than a mile from the junction.

Now the latest phase of the project looks set to close a handful of major routes in the area over the course of the next month.

The A350, the A429 and the M4 entrance slip way at junction 17 will all be closed at different points from September 29 until October 21.

The closures will take place between the hours of 8pm and 6am.

The Wiltshire Gazette and Herald: Roadworks at M4 junction 17Roadworks at M4 junction 17 (Image: Trevor Porter)This is to allow MJ Church to carry out roundabout resurfacing and relining works.

Motorists have been warned to expect delays during this period and will be forced to seek alternative routes.

The closures will be carried out over four phases, the first of which will see the B4122 at Kington Langley close between junction 17 and Clanville Way.

This will be followed by the A429 being shut for a small stretch north of the junction.

Then the A350 northbound will close from the Malmesbury Roundabout to junction 17, before the final phase sees the M4 entrance slip way shut.

During these final two phases motorists trying to enter the M4 from Chippenham will be diverted to junction 16 at Royal Wootton Bassett, via the A420, A4 and A3102.

The Wiltshire Gazette and Herald: Roadworks at M4 junction 17Roadworks at M4 junction 17 (Image: Trevor Porter)The roadworks at junction 17 are expected to last until November of this year.

In May, councillor Caroline Thomas, the cabinet member for transport, said: “This development seeks to deliver 1,000,000sq foot of employment space and infrastructure. No more than 350,000sq foot can be occupied prior to the junction works being completed. The works are currently planned for completion by the end of November 2023.

“The works have been formerly agreed with National Highways who remain the overseeing authority for the works, with Wiltshire Council providing necessary inspection support. Once completed, the responsibility for the junction circulatory will return to Wiltshire Council and the traffic signals will remain with National Highways.”