Drowsy drivers are a danger to themselves and others on the road. Additionally, for many commuters it is hard to get ample time to exercise during the week as commuting time eats away at personal time. The ExcerCar project is an effort to enhance both alertness and physical activity. We are developing an exercise interface to the vehicle that counteracts the effects of fatigue and inactivity while driving. The hypothesis is that exercise will mitigate the effects of fatigue and increase a drowsy driver's alertness. Put another way, can Fred Flintstone's car make him a more alert driver?