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What is the Height Restrictions of the Blackwall Tunnels?

Answer

The Blackwall tunnels are a pair of tunnels underneath River Thames in London. As of 2011, the tunnel is restricted for vehicles which are above the height of 4m. The tunnel was opened in 1897 by the Prince of Wales.
1 Additional Answer
The height and hazardous goods restrictions at the Blackwall Tunnel is 4 meters. Some vehicles use the alternative route for northbound traffic and travel clockwise around the M25 if their height is past the 4 meters.
Q&A Related to "What is the Height Restrictions of the Blackwall..."
As the Blackwall Tunnel consists of 2 tunnels there are 2 different restrictions: 15' 6" Southbound and 13' 3" Northbound.
http://www.kgbanswers.co.uk/what-is-the-height-res...
Blackwall Tunnel: 15'6 Southbound. 13'3 Northbound.
http://www.kgbanswers.co.uk/what-is-the-height-lim...
Nothing over 8' wide or 13'6" is allowed in the Baltimore Harb.
http://www.chacha.com/question/what-is-the-height-...
The Dartford Tunnel joins Dartford & Thurrock across the River Thames in London. It was first opened in 1963. Max. height restriction is 5 metres (16.5ft) report this answer.
http://www.kgbanswers.co.uk/what-is-the-height-res...
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