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[0] Navigating traffic lights & junctions [1] High: collision with other riders, collision with general traffic [2] follow marshals' instructions: a large column of riders, pedestrians is considered in law as one long vehicle. [3] over-excitement & hesitation among riders against impatient motorists [4] 
If ride body becomes split, the front steward will stop after crossing any junction, and wait until rear of group is across junction
Cardiff - World Naked Bike Ride (WNBR) - Wiki information site
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