Wouter van den Bosch, a Dutch art student and former mechanical engineer, made a 450-kilogram monster bike that took the 29 year old three months to build. It is made from steel tubes, bicycle parts and a tractor tyre. (Photo/VCG) World Car Free Day is celebrated on Sept. 22, when people are encouraged to ditch their cars for the day and find alternative ways to get to work. Check out these photos of some creative alternative vehicles.
