So, I just remade animation from scratch.
It was too dificult for me to control both things at same time.
First I'll do speed/ position and then rotations.

I got other little question, if model group is assigned to motion path, How could i add other models to it, move together.
standart grouping doesn't help, I need to put model inside group tree.
And as well I need opposite, how to remove model/mesh from group that is assigned to motion path.
picture explains better


vehicle and camera is attached to motion path, and seat is not, when it should, so i need to move it inside that group.