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Map Based Road Projects Finder - Feedback
We are currently piloting a new map based tool to help you find road projects. Please let us know what you think
The Project Control Framework
This framework sets out how we, together with the Department for Transport, manage and deliver major road improvement projects.
Closures
M48 Severn Bridge Closures - High Winds
Did you know that between 1992 and 1996, 13 vehicles blew over on the Severn Bridge, resulting in more than 47 hours of closure? For safety reasons, the Severn Bridge currently operates under a High Winds protocol based upon the gust wind speeds measured by the anemometers situated on the Crossing. Restrictions are implemented as follows:
• Wind speeds reaching 30 knots - advisory 40mph speed limit in place
• Wind speeds reaching 35 knots - leeward lane in each carriageway closed to traffic
• Wind speeds reaching 40 knots - crossing closed to motorcycles and vehicles over 2.1m in height (see 'Traffic Filtering' below)
• Wind speeds reaching 60 knots - crossing closed to all traffic
These restrictions/closures remain in place until the gust wind speed has fallen and remains below 35 knots for 30 minutes, and the current forecast does not increase to over 40 knots within the next 4 hours. Records show that wind-related closures typically occur between January-March and October-December.
The M4 Second Severn Crossing was designed to include wind shielding and has not had to close during periods of high winds.
Traffic Filtering
We recognise that closing the M48 Severn Bridge to all vehicles during periods of high winds has an impact on road users by increasing journey times and, at times, congestion on the M4. This is why we are looking at ways to keep the bridge open to small vans and cars for longer whilst still operating safely during such times.
In September 2007, we introduced a traffic filtering system. Once wind speeds reach 40 knots, the bridge will remain open to vehicles under 6'9" (2.1m). Vehicles over this height and motorcycles will not be permitted to use the Severn Bridge, and must use an alternative route. Filtering will operate between 0600 and 2200 hours. Outside of these hours, the bridge will be closed to all traffic if the wind is above 40 knots. If wind speeds reach 60 knots, the bridge will be closed to all traffic.
For further maintenance and lane closure information and current bridge status for both crossings, please visit the Severn River Crossings website at www.severnbridge.co.uk.
