Truck scene

To play and drive in this scene, It is enough to move the car controller object forward in the axis of +y  to accelerate and backward to do the opposite

Move on the X-axis to steering.

In the(N panel) properties of the car controller object, you can have a series of settings for the amount of car suspension, ground and tire friction, speed value and...

The amount of speed has a direct relationship with the amount of movement of the controller in the Y axis.

I hope you enjoy it.