Checking the bridges…
Last checked – · updates automatically
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Speed over the last 24 hours
Live speeds: average across each bridge's road section, from TomTom, updated every 5 minutes. "Normally" is the speed when traffic is light. Typical traffic: National Highways road sensor counts for the same weekday and hour over the past two years.
Forecast at 10 m in knots, from Open-Meteo. Wind on the bridge decks is often stronger, so use this as a guide to when restrictions are likely.
Show forecast as a table
Planned closures in the next 7 days
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Traffic cameras
Live camera images belong to National Highways and Traffic Wales. Their camera maps show the approaches to both bridges:
- Traffic Wales cameras – M4 and M48 on the Welsh side
- National Highways – Traffic England – M4, M48 and M5 on the English side
History
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How wind restrictions work
| Gusts | What happens |
|---|---|
| 30 knots | 40mph speed limit |
| 35 knots | Leeward lanes close |
| 40 knots | M48 Severn Bridge closes; traffic diverted via the Prince of Wales Bridge |
| 70 knots | Both bridges close |
The Prince of Wales Bridge has wind barriers, so it is rarely affected. Thresholds published by National Highways.