Non-standard movement on the path

Such a task: the player presses the button to the right and to the left, and moves his car only a drawn smoothed the path like this:

up

And the question is?

How can I do this on c2?

It might be me, but I don't really understand what you want to achieve..

I see a line and I see arrows..

How would the player controll the car?

You are talking about pushing buttons, so what would happen if the player doesn't push the button at the right time?

Is the path made by you before the game starts?

Yes, this way, such as rails, made ​​before the start of the game.

Player - let it be a car. Is on the way-spline. If the player does not press - the car is not moving. When you press the left or right the car is moving along this path (to the right - arrow)

you could do it like this example but, you have to work out all positions