Traffic is stationary on the M4 eastbound near Brynglas tunnels as emergency crews respond
The M4 eastbound carriageway is currently closed in the area of the Brynglas tunnels following a collision that has left vehicles unable to pass. According to live traffic monitoring, all traffic is being held between J26 A4051 (Malpas Road) and J25A A4042 (Newport / Cwmbran).
Cameras operated by Traffic Wales show a long line of queued vehicles, and the incident has prompted an immediate response from local authorities. For clarity, stationary traffic here means that vehicles are not moving and remain held on the carriageway while responders attend the scene.
Emergency services are attending the scene and have confirmed the road closure while they manage the collision and related hazards. The traffic information service Inrix reports that all traffic is currently being temporarily held, while the AA traffic planner has logged significant delays.
Motorists are advised to expect extensive delays if travelling eastbound and to seek alternative routes where possible. The local police force, Gwent Police, has issued advice that diversions are in place and motorists should avoid the area to reduce congestion and aid access for emergency crews.
On-scene response and safety measures
Emergency responders have prioritised securing the site and assessing any injuries, with several people reported to have been taken to hospital following a separate incident at nearby Cardiff Gate services, where a vehicle struck a building. Crews from ambulance, fire and police are coordinating activity, and highways teams are supporting traffic management. Officials have set up a perimeter and are directing vehicles away from the immediate area; the use of diversions is to redirect traffic safely around the closure. Travellers should be aware that these measures can lengthen journey times and create knock-on congestion on surrounding roads.
Traffic conditions and reported delays
The AA has advised that delays of around 50 minutes are currently being experienced eastbound on the M4, with particularly heavy congestion between J28 A48 (Tredegar Park) and J25A A4042 (Newport / Cwmbran). Average speeds in the affected stretch are being recorded at around five miles per hour, reflecting severe slow-moving conditions. Traffic Wales camera feeds show long stationary queues near the tunnels, and navigation systems are updating to reflect the hold. The combination of the tunnel closure and adjacent incidents means that relief for motorists is not immediate; drivers should plan for considerably extended journey times.
Delays, diversions and driver guidance
Road users are urged to follow the signed diversion routes and official guidance from Gwent Police and highways teams. A useful definition: diversion routes are temporary paths set up to maintain traffic flow while the main carriageway is unavailable. Diversions may direct traffic onto local roads that are not designed for heavy volumes, so extra caution and patience are essential. If possible, avoid the area entirely and use real-time navigation tools to reroute; public transport users should check services for possible disruption caused by the wider congestion.
Wider context and earlier incidents
Tensions on regional roads have been higher than usual as people travel in warm weather and for holiday periods, which has increased traffic volumes across the network. Earlier today a separate collision at junction 37 affecting routes to Porthcawl caused delays but has since cleared. The current event near the Brynglas tunnels is the most disruptive, but combined incidents can amplify congestion on arterial routes. Authorities continue to monitor the wider situation and will provide updates as lanes are reopened and vehicles are cleared.
Staying informed
Motorists should follow official channels for the latest information: Traffic Wales for camera updates, Inrix for live traffic reports and Gwent Police for safety notices. Local radio and navigation apps will also reflect changes to journey times. If you are on the road, keep safe by maintaining space around emergency vehicles, refraining from using mobile phones while driving, and only proceeding when instructed. Authorities will reopen the carriageway as soon as it is safe to do so and will issue further guidance to clear affected traffic.
