My Idea deals with children left in hot and cold cars, Since the seat belt can tell if someone is sitting in the seat use the same sender in the back seat with like a 10lb sensor to make up for the car seat and make it so the car will not shut off if there is a baby in the back seat. You can add a over ride switch on the dash so it can be shut off if its something else in the seat. Please be the first to put this in cars, I don't have the money to do this but I think you would get a lot of parents to buy your brand over others if you do this. There is no way that a child could be left in the car without the driver knowing