Tunnel Running is a kind of recreational motor vehicle activity, in the form of a road rally for owners of high performance sports cars. It emphasises recreational driving in a group, and in particular, journeys involving tunnels, often at night when little other traffic is present. At times convoys of over 200 cars have driven through tunnels in this manner. Like flash mobs, tunnel runs tend to be organised in a clandestine manner, although some groups do inform police about 'runs' beforehand.
The activity originated in 2004 in the UK and focuses on the enjoyment of the noises engines make in enclosed spaces rather than outright speed, this makes it rare among sports car clubs The originating group runs regular "Tunnel Runs". They are known as the London Tunnel Runners and were founded in 2004.
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