Im ashk and I have an idea to save more energy for cars.
As you know, it is necessary to convert electrical energy into mechanical energy in order to move the car. Now, if we do the same, we can save the extra energy that we have to stop the car by getting unused energy back. That is, when the car starts to move, then driver attempts to stop the car, the extra mechanical energy is used to stopthe car and attempt to hold the car. but turning it back from mechanical to electrical energy will stop the car and also saves extra energy which was used to move the car through a point.