**Major Severn Bridge Restriction for Heavy Vehicles Begins: What It Means for Traffic and Drivers**
From today, a significant new traffic restriction comes into effect on the historic M48 Severn Bridge, which connects England and Wales. Vehicles weighing over 7.5 tonnes will now be prohibited from using the bridge for at least the next year, in a move that authorities say is essential for public safety but that has already sparked concerns over potential travel disruption and congestion.
The restriction, which aims to protect the bridge’s structure following concerns over cable deterioration, was initiated after recent inspections by National Highways identified worrying signs of wear and tear in the main suspension cables. These findings have prompted urgent action to mitigate further structural damage, with the ban expected to stay in force for an initial period of 12 months, and possibly as long as 18 months, depending on the results of ongoing monitoring.
As a direct consequence, all heavy goods vehicles (HGVs) and lorries above the 7.5-tonne threshold will be diverted to use the nearby M4 Prince of Wales Bridge instead. This secondary crossing, already one of the busiest links between Wales and England, is bracing itself for increased demand as an extra 3,000-plus HGVs per day—previously using the Severn Bridge—join the traffic flow. This represents roughly 10% of the daily vehicles that previously crossed via the M48.
Transport experts have warned that the move is likely to affect all motorists using the M4 Prince of Wales Bridge. “The diversion for HGVs is not insignificant—at around 13 miles longer—and will funnel more large vehicles onto an already congested route,” explained Rhydian Jones, a spokesperson for the car insurance service Confused.com. “Drivers can expect longer travel times, particularly during peak commuting hours and busy holiday periods. Planning ahead and allowing extra time could save considerable stress, especially for those on tight schedules, such as those catching flights from Bristol or Heathrow.”
In an effort to reassure the public, National Highways has stressed that these measures are not a result of an imminent safety threat, but a necessary step to preserve the bridge’s long-term viability. “Safety is our top priority,” said Chris Pope, Programme Delivery Manager for National Highways. “While the bridge remains safe for lighter vehicles, it was never designed to accommodate current levels of heavy traffic, which have risen steeply since the bridge was first opened nearly six decades ago. Larger and more numerous vehicles place strain on the structure, accelerating cable deterioration.”
The increased usage of the Severn Bridge is in part due to the scrapping of tolls in 2018, which National Highways says has led to a 34% surge in traffic volumes. Pope added, “We must take action now before the deterioration worsens. Continued use by overweight vehicles could force us to close the bridge to all traffic—a scenario we are determined to avoid.”
Despite the weight restriction, the M48 Severn Bridge will remain accessible to emergency response units, buses, coaches, gritting and recovery vehicles. In situations where the Prince of Wales Bridge is closed without warning, diverted heavy vehicles will be mandated to follow signed routes via the M5 and M50. Authorities are also considering the use of automatic number plate recognition (ANPR) cameras to assist with enforcement and ensure compliance with the new rules.
National Highways has called on drivers to be patient and cooperative while the restriction is in place, emphasising the importance of safeguarding the crossing for future generations. Motorists are being urged to keep abreast of live traffic updates and, where possible, to avoid travelling at traditional peak times.
The Severn Bridge, an iconic structure spanning the River Severn, has supported regional connectivity for nearly 60 years. As vehicles have grown larger and heavier, and as travel patterns have shifted, the need for ongoing repairs and adaptations has only increased. With safety at the forefront, the authorities hope these measures will secure the bridge’s place on the UK’s transport map for many years to come. As the changes take effect, the coming weeks will be a test both for the resilience of the road network and the patience of those who rely on it daily.