control the speed of my car?

I want to change the speed of my car, that is to say ,the speed is limited in the max and min, when i press a key to increase the speed, it speed until the max, and i press a key to decrease the speed, the car will slow down until the min. Any one know how to do that? thank you !:spin:

Use LinV settings at about 1 and on add (not set). Theses will be the acceleration.
Then set the max and min values.
That should work.

Hi. I have changed and uploaded an example http://jumbofiles.com/bxh7c849jf8d.

HG1