What is Blackwall Tunnel?
The '''Blackwall Tunnel''' is a pair of road tunnels under the River [[Thames]] in [[East London]]. They link the [[London Borough of Tower Hamlets]] with the [[Royal Borough of Greenwich]]. They are part of the A102 road. For road traffic, the tunnel is one of the most important ways of getting across the Thames. It is crowded almost 24 hours a day, and a vehicle breakdown is close to being a major emergency. The tunnel was originally a single-bore tunnel in 1897, with mainly horse-drawn traffic. It was doubled in 1967, years after this had been needed. The northern approach is from the [[A12 road]], and the southern approach is from the [[A2 road (England)|A2]]. [[Category:Roads in London]] [[Category:Tunnels underneath the River Thames]]