M48 Severn Bridge Weight Restrictions: What Fleet Operators Need to Know

Starting 27 May 2025, the M48 Severn Bridge will impose a 7.5-tonne weight limit on heavy goods vehicles (HGVs), a measure set to last between 12 to 18 months. This decision follows safety inspections revealing deterioration in the bridge's main suspension cables, necessitating a reduction in load to ensure continued operation for lighter vehicles .​

Understanding the Restrictions

The weight limit applies to most HGVs over 7.5 tonnes. However, exemptions are in place for emergency services, gritters, recovery vehicles, buses, and coaches . Affected vehicles will need to reroute via the M4 Prince of Wales Bridge, adding approximately 14 miles to their journey .​

Implications for the Logistics Sector

The M48 Severn Bridge is a vital artery for transport between England and Wales, handling around 32,000 vehicles daily, with approximately 10% being HGVs over 7.5 tonnes . The diversion is expected to impact delivery schedules, increase fuel costs, and potentially strain the M4 Prince of Wales Bridge with additional traffic.​

Concerns have been raised regarding the reliability of the alternative route, especially during peak times or unforeseen closures. In such events, HGVs may face detours of up to 100 miles via the M5 and M50 .​

Looking Ahead

National Highways is exploring medium-term solutions, including technological and traffic management tools, to potentially lift the weight restriction while ensuring safety . Fleet operators are advised to stay informed about developments and plan accordingly to mitigate disruptions.​

For more detailed information and updates, visit National Highways' official page.