If you switch the little crise control button on behing the steering wheel (cant remember if its up or down though, as one is the speed limiter) then you will get a little green symbol showing, then press the R on the steering wheel it should set at the speed you are going. To slow it down, just press the + or - button on steering wheel. As soon as you break it will be deactivated, or I think there is an O which also deactivates. But I haven't used it for a while, so someone else will probably explain better, lol!