Severn Bridge (M48) Refurbishment
South West England, UK · Ongoing (main cable inspection 2016; weight restriction from May 2025) · Approx. £2.4M (for main cable inspection, 2016 prices, converted from $3M)
The judgement call
Account-gated at launchDecision to implement a weight restriction highlights critical structural concerns and the need for continuous monitoring. - Long-term maintenance and inspection programs are crucial for aging infrastructure to ensure safety and extend lifespan. - The economic and logistical impact of weight restrictions on regional transport and hauliers.
Key engineering challenges
Addressing significant corrosion in main cables. - Implementing a 7.5t weight restriction due to cable capacity assessment. - Maintaining structural integrity of an aging suspension bridge. - Managing traffic impact during maintenance and restrictions.
Project facts
- Client / owner
- National Highways
- Lead contractor
- American Bridge (for main cable inspection)
- Lead designers
- —
- Project type
- refurbishment | upgrade
- Scale
- 2.22 km (1.38 miles) suspension bridge
- Disciplines
- Civil; Structural; Materials; Geotechnical
- Standards & frameworks
- —
Sources: National Highways: https://nationalhighways.co.uk/travel-updates/the-severn-bridges/ - American Bridge: https://americanbridge.net/featured-projects/m48-severn-bridge-main-cable-inspection/ - Wikipedia: https://en.wikipedia.org/wiki/Severn_Bridge - New Civil Engineer (2025): https://www.newcivilengineer.com/latest/national-highways-severn-bridge-cable-assessment-left-little-choice-but-weight-restriction-25-04-2025/ - UK Parliament (Written Evidence): https://committees.parliament.uk/writtenevidence/66930/html/