PLEASE HELP... What is traction disabled?

I have a 95' Cadillac Sedan Deville. On my computer when I'm driving it keeps blinking traction disabled and service ride control, What does that mean? How do I fix it? My car kind of shakes when I take it past 70mph. I'm not sure if that will have something to do with my problem.

The traction disabled message is probably from a bad wheel speed sensor. But to be sure, you'll have to check the computers codes. Press and hold both the "off" and the red warmer buttons for the climate control. Hold them both for a few seconds, and the dash will light up, and display the codes. Write them down and let me know what it says. The codes will be 4 characters, like S072, or P039, etc. After it is done with all the codes, it will display "PCM?", then you can just turn the car off, or press the "auto" button on the climate control to return to normal.