Thelwall Viaduct: 40mph contraflow arrangements for M6 drivers
National Highways' current project notice sets out lane arrangements between junctions 20 and 21.
National Highways has set out a 40mph contraflow between M6 junctions 20 and 21 for bridge-joint replacement work at Thelwall Viaduct. Its update dated 15 October lists the northbound phase as starting on 19 October 2026.
The announced daytime layout keeps four lanes in each direction, with one northbound lane using the southbound carriageway. The 40mph restriction applies in both directions.
At night, the notice says one northbound lane continues on the southbound side while the northbound carriageway itself is restricted to one lane between 10pm and 5am. It says the junction 21 northbound exit remains open during this first phase.
These are the authority's published arrangements, checked on 24 October, rather than a live traffic report. Drivers should check the project's latest notices and live travel information before setting out.
Where this report comes from.
AI-assisted summary checked against National Highways' full current project page on 24 October 2026. Its relevant update is dated 15 October and specifies a 19 October phase start; the original page publication date is unknown. The expired 20 October overnight closure is not presented as upcoming, and no live traffic conditions are inferred.
- National Highways: M6 Thelwall Viaduct bridge-joint projectnationalhighways.co.uk · Source publication time not supplied
This is a summary and contextual report based on the linked material. It is not an eyewitness account or an original interview. Read our editorial standards.
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