Travelling in a car is far less harmful then if you travel on a motorbike.
Assuming you are in the car that stopped at the light and you hit the car that was passing, It is obvious the car passing illegally on the right gets the ticket and the blame and had better have insurance.
an hydro power car saves aboout 49% of energy
I don't know of any hydro powered engine for cars
The passing truck causes a vacuum that causes your car to move. The same thing with passing trains, that's why the have the yellow line to stand behind.
air
If you overtake a car on a bend or if there is an oncoming car.
They can't do that, plain and simple.
when you pass a car if you imagine that you are not moving it will seem that the car you are passing is going in reverse
Nope.
cause the truck has more power and it increases the cars speed and the speed slows the car and makes it work arder to pick up speed
No, you don't have to single, nor do you have to signal. Learning to spell before passing a parked car would be more important than to do a single or a signal.