I don't think using supersonic cars in real life is a good idea. First, supersonic cars must be very expensive that only few people from the upper class can afford it. If they buy them and want to drive them, it will give us huge problems including the limited speed and etc. We can't change the traffic lanes and traffic laws caused by those minorities. Not only changing stuffs, it will cause many serious accidents, if the driver can't manage the car and its speed. Second, how are they going to afford the money which is required for its fuel and extra expenses? To draw the speed till sonic speed will require large amount of resources and money. We can't waste oil and coal to make the 'car' move. For these reasons, I don't want supersonic cars to be open-marketed.

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Happy weekend!