As price of petroleum products are increasing day by day, solar energy is just perfect replacement for petrol-powered vehicles.

Solartrike, a Solar-Powered Bike, is a similar effort that may gain 15-18 mph speed and runs 10 miles for each charge that either requires a 200W or 400W motor with 80W solar panel, and a 2×2 quadrangle steel casing.
Via: techeblog