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J17 go-faster scheme

June 20, 2022 2:51 PM

Wiltshire Council wants to spend £27million so drivers can get through Chippenham's M4 junction more quickly.

The junction, which links the motorway network and the A350, A429 and B4122, was last modified in 2018, when traffic signals were installed on the slip roads. However, further improvements are required.

The scheme includes installing more traffic signals on the roundabout; widening the approaches to the stop lines at the signals to increase the number of traffic lanes; and increasing the number of lanes on the bridges from two to three.

The council is currently preparing an Outline Business Case (OBC) for the scheme. Once complete, the OBC will be taken to the Department for Transport, which will decide whether to fund the scheme.

Cllr Dr Mark McClelland, Cabinet Member for roads, said: "This important junction connects the towns in west Wiltshire, including Chippenham, Melksham and Trowbridge with the motorway network via the A350, and also provides a link to Malmesbury and the A429 to the north.

"If approved, this scheme would reduce delays, particularly during peak periods when long queues can form, increase capacity and improve safety, and also help to future-proof the junction to accommodate future traffic growth. It also meets our business plan objective of having well connected communities, and our pledge to improve this junction.

"Of course, we are working closely with National Highways on this, as it is responsible for the motorway and slip roads, while we are responsible for the junction and roundabout above it.

"I'd urge any interested local residents and businesses to contact our Major Highways Projects team with any comments they may have, as this will help to inform the Outline Business Case that we'll take to the Department for Transport."

Construction will start in 2024 and the scheme will be completed in 2026.

To comment on the proposals, email or write to: Major Highway Projects, Wiltshire Council, Trowbridge, Wiltshire BA14 8JN.

To find out more about the scheme, go to