What Happened on the M4? Overturned Vehicle Causes Major Delays!

Drivers on the M4 are facing significant delays this morning due to a combination of adverse weather conditions and multiple incidents. Key issues include an overturned vehicle near Bridgend that has closed one lane and delays caused by flooding and a breakdown on the Prince of Wales Bridge. Traffic is reportedly queuing from Junction 36 to Junction 35, highlighting the need for caution and alternative routes.

Last updated: 12 September 2025 (BST)

Current Traffic Conditions on the M4

This morning, the M4 has been severely impacted by wet weather, leading to hazardous driving conditions. As a result, several incidents have compounded traffic woes across the region. Here are some key takeaways:

• One lane closed on the M4 eastbound due to an overturned vehicle near Bridgend.
• Delays on the Prince of Wales Bridge from flooding and a broken-down vehicle.
• Traffic monitoring system Inrix reports queuing traffic from Junction 36 to Junction 35.
• South Wales Police are advising drivers to avoid the area.
• Traffic Officers are present at the scene to manage incidents.

Details of the Incidents

As reported, the overturned vehicle incident is located between Junction 36 (A4061) and Junction 35 (A473), causing significant disruption. The overturned vehicle has led to the closure of lane three in both directions, impacting traffic flow. Additionally, the ongoing issue on the Prince of Wales Bridge is due to flooding and a breakdown, further complicating the traffic situation.

Impact of Weather Conditions

Wet weather is a common factor affecting driving conditions in the UK. Rain can reduce visibility, increase stopping distances, and lead to slippery road surfaces. As a result, drivers are urged to exercise caution, particularly in adverse conditions like those experienced this morning.

Advice for Commuters

Given the current traffic conditions, commuters are encouraged to consider alternative routes if possible. South Wales Police have advised the public to avoid the affected areas and expect delays. Here are some tips for navigating the situation:

• Check real-time traffic updates via traffic monitoring services.
• Consider using public transport if available.
• Allow extra travel time to account for delays.
• Stay informed about weather conditions that may affect travel.

What to Expect Ahead

The situation on the M4 is fluid, and while authorities are on-site handling the incidents, it may take time for traffic to return to normal. Drivers should remain patient and vigilant, as further updates will be provided by traffic monitoring services and local authorities.

Understanding the Traffic Monitoring System

Traffic monitoring systems like Inrix play a crucial role in providing real-time updates on road conditions. They analyse a vast amount of data from various sources, including GPS signals from vehicles, to offer accurate traffic information. This can greatly assist drivers in making informed decisions about their routes.

Additional Resources for Drivers

In addition to traffic monitoring apps, other resources include local radio traffic updates, social media alerts from traffic authorities, and navigation apps that provide live route adjustments based on current conditions. Utilising these tools can help mitigate the impact of delays.

FAQs

What should I do if I encounter an overturned vehicle on the M4?

If you come across an overturned vehicle, maintain a safe distance, and do not attempt to assist unless you are qualified to do so. Contact emergency services immediately to report the incident.

How can I stay updated on traffic conditions?

Utilise traffic monitoring apps, follow local traffic authorities on social media, and listen to traffic updates on local radio stations to stay informed about road conditions.

What alternative routes can I take to avoid the M4 delays?

Alternative routes will depend on your starting point and destination. Consider using local roads or alternative motorways, but ensure you check traffic conditions beforehand to avoid further delays.

Is it safe to drive in wet weather?

Driving in wet weather is safe if you take the necessary precautions, such as reducing speed, increasing following distances, and ensuring your vehicle's lights and wipers are functioning correctly.

What are the penalties for driving without due care and attention?

Penalties can vary but may include fines, points on your driving licence, or even disqualification from driving, depending on the severity of the incident.

As the situation develops on the M4, drivers are encouraged to stay vigilant and informed. How do you plan to navigate the ongoing disruptions? #M4Traffic #SouthWales #DrivingSafety