Backpack Bike
People in big cities might be avoid cyclists. Maybe you have a terrible problem when you have to bring the bike into the elevator. And if you live in apartement it would be problem too.
The Backpack Bicycle solves this problem by folding up the bike into a compact transport for your back. The designer, Chang Ting Jen, also reduced the weight of the bike by using plastics instead of metal.
This easily transportable Backpack Bike weighs in at about 5.5 kg, and can also be switched around to become a hand-cart. So far the design is a concept now. However, I believe the designer had the public transportation system in mind when he designed this vehicle. The Backpack Bike could easily be taken with you on a subway or bus, and would be worth mass-produce.