Just gave it some thought after playing Need For Speed: Hot Pursuit.
Have a race in a dark room and the only thing racers would need is an LED headlight equipped car. Well, cars without LED lite-up headlamps may participate I guess, even though they have a significantly lighter weight, it is most likely that the driver will not be able to see a thing unless the track is lit up for him by other cars. Some small obstacles might prove challenging, pylons etc.
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