Olympic Games Lanes

Here's the map: http://www.tfl.gov.uk/assets/downloads/corporate/london-2012-olympic-route-network.pdf

Not actually that many roads in the East, but as anyone who has driven around this way knows it only takes a small delay somewhere to gridlock huge parts of the road network.

Yep, if ANYTHING goes wrong in the Blackwall Tunnel the traffic soon backs up for three or four miles.