Does anyone know how to limit the top speed of a car. My 97+ year old mother insists on driving, she has a 2001 Buick Century V6. My brother-in-law disabled her car so she can't drive (which has made her angry). However winter is coming and rather than walking up town (she lives in a community of about 400) for groceries & mail pickup, she'd like to drive to save falling down and getting hurt (or worse). I can find how to increase a top speed, but not how to limit the speed to say 25 mph. Any ideas?