Do you remember the car pictured? It's the concept Ford Nucleon! In the late 1950s, it would have had a small nuclear reactor and would have driven us for thousands of miles without refueling. A shame that nuclear energy has so many drawbacks (or potentials for growth, in estate agent language).
The company MPK has created Litrospheres, a new material that's inexpensive and stays lit, with the power equivalent to a 20 watt incandescent bulb, for 12 years without any energy input. As you can see in the above photo, this could be the perfect solution for lighting vehicles, maybe even car head lights. The only problem? It's radioactive. Still, it's just "soft" radiation and the radioactive gases are in tiny sphere so it won't kill you.