observations..
Using your trampoline example, will you simply pass the cost of producing the energy onto the drivers of the cars with lower gas mileage?
Going back to our trampoline, it takes more energy to walk across a trampoline than it does to walk on solid level ground. Your body is constantly climbing out of holes.
If you do not match the rolling resistance of the energy producing road with that of a solid roadway will you risk increasing the rolling resistance of the roadway to get the additional energy zackers mentioned?
Does tire wear also increase with increased rolling resistance?
On another point, friction between the tires and the roadway make the heat mentioned by zackers.
Either the road material needs to convert that heat into energy or the heat is still lost energy in the process of moving a vehicle. The only other way to reduce the heat is to reduce the friction that keeps the cars on the roads. A good analogy is driving on bald tires or on an oily road after a big multi-car accident. Eliminate the friction between the tires and the road and you eliminate the heat, but you also slid all over the place.
These are just a few of the issues that killed the same free energy proposal made in California in the 1980s.
