Mayor of London Boris Johnson was out riding the new segregated cycle superhighway on Vauxhall Bridge when he encountered a commuter going the other way.
Clearly not a fan of the Tory MP for Uxbridge and South Ruislip, the rider can be seen raising his middle finger as Johnson happily waves back.
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The Mayor was riding the route to officially open cycle superhighway five.
The route now includes Dutch-style segregation of cyclists from motor traffic from The Oval in Kennington to Pimlico, a distance of almost a mile.
The overall scheme has a budget of £18 million with the hope of allowing bicycle users to cross the capital separated from cars, buses and lorries.
Segregated cycle paths will help get more people on bikes and shift the image of cycling being the reserve of young white men in lycra.
Impetus has been given to making London a cycling city thanks to the Mini Holland schemes in some Outer London boroughs, but also by the concerningly high number of cyclists being injured and killed in collisions with vehicles.