Zurich, Switzerland is historically a rather bike-friendly city. It's moved even further in that direction with the opening of tunnel made exclusively for the use of bicycles. Canadian Cycling Magazine reports that the city spent approximately $47 million USD to build this tunnel which is just over a quarter mile long and as wide as 20 feet.
There's clear signage, lighting, and video surveillance in the system. To facilitate its use, the tunnel is adjacent to a bicycle parking complex that can accommodate 1,240 bikes. City officials hope that this tunnel and its amenities will decrease road congestion during high-traffic times.
-via TYWKIWDBI