It sounds like you've been very creative in your tactical implementation for converting motion into electricity. You might get a good grade for your calculations and your understanding of the principles involved, but none of this will help Global Warming because you're still using gasoline to produce electricity, and if that's all you want to do, there are more efficient ways to do it.
The best way to get energy back from moving vehicles is to find a way to save/store the otherwise wasted energy of braking. For example, you could capture waste energy by using the brakes to turn a generator instead of allowing the energy to be heat up the brake pads.
Or you could get really tricky and figure out some way to use your roadway magnetic design to slow the car and capture that energy.