Proportional brake lights: Many already do this. Fuel Consumption Monitor: Many cars offer something like this (particularly hybrids) and it's almost standard

Proportional brake lights: Many already do this. Fuel Consumption Monitor: Many cars offer something like this (particularly hybrids) and it's almost standard now. Insurance GPS: Progressive offers this service, called "Snapshot", already. Music Systems: Neat idea but will detract from sales/create a market for modded stereos that don't do this. Plus, I always crash when I hear classical music. :-) Teaching Driving Efficiency: Will be hard to demonstrate efficacy; they teach you not to exceed the speed limit and that doesn't work so well. Polychromatic paint to shame reckless drivers: Interesting, but expensive, and perhaps a bit too arbitrary. Don't know if I should have to drive a yellow car after swerving to avoid a squirrel. And my car's already yellow. I'll add: A nodding sensor. As people nod off from sleep deprivation, an audible "you are nodding" sound and a speed limiter to 25mph will kick on in 1 minute, prompting an exit/pull-over and a nap. And perhaps an eye detector, like on a Kinect. If the line of sight between your pupil and the sensor on your dashboard is interrupted for more than 5 consecutive seconds, an alarm goes off. Would make texting while driving less fun.