The City of Copenhagen established the first Green Wave for cyclists back in 2007 on Nørrebrogade and, since then, the concept has spread to other major arteries in the city. The idea is simple. Coordinate the traffic lights for cyclists so that if they ride at a speed of 20 km/h, they will hit green lights all the way into the city in the morning rush hour. The wave is reversed in the afternoon so bicycle users can flow smoothly home, too. 20 km/h was decided upon as the speed in order to improve the traffic flow of bicycles. The average speed of bicycle users in Copenhagen is about 16 km/h. A wave of 20 km/h encourges some to go a bit faster but it also encourages the faster cyclists to slow down in order to benefit from the green lights. The rush hour on the cycle tracks is intense in Copenhagen and speed demons do more harm than good regarding safety and, almost more importantly, perception of safety. As it is now, the Green Wave is in place on Nørrebrogade, Amagerbrogade, p...
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