Electric-powered breaks 300mph
When I was at Western Washington University, I got to see one of their solar cars. They usually did pretty good in a variety of solar car races. This electric car from Ohio State University isn't solar powered, but since all solar cars are electric cars (I think), then maybe one day we can have a solar car that can cruise down a freeway just like a regular car.
See the article about the car at: http://www.ohiounion.com/studentorgs/articles.asp?ID=312