Design and implement a prototype electric vehicle. For doing this you can take help from this website
Due to the danger of global warming and increasing price of fossil fuels , the need of other source of energy is unavoidable. Electric cars are one of the step towards this goal.
This project can be costly but if build , will familiarize you with all necessary concepts of future technologies used in cars. If you are interested in this project do it with the group.
What wiki says about city cars