Now that seems like a nice idea.

(PhysOrg.com) -- When you get into your car, for the daily commute or for a relaxing weekend visit to a friend house you give off energy. Not just the energy from the fossil fuels that you burn, but a different kind of energy, vibrational energy. Most of us do not give that energy a second thought, unless we're trying to do something that requires fine motor skills, such as putting the lid back onto your slightly deformed cup of scalding hot coffee, but it is there.
The system, if implemented, would place sensors under a stretch of California roads. These sensors would be able to collect the vibrations caused by traffic and covert them into power.
California may use vibrational energy of driving to generate power