The Solar Human Hybrid is a street-legal quadricycle with a solar-powered electric motor to help you along, room for three friends to join you in the fun and even a spot for groceries and your dog.

Take two bikes, stretch them out lengthwise, connect them side-by-side, add a two-person bench where the seats were ... and you have the recipe for Troy Kellett's "quadricycle." Kellett was inspired ...