> Street racing is entirely too dangerous and of course illegal

Someday I wonder if that will change?

Consider a future where full self driving cars have been perfected, to the point that they are mandatory. Every car on the road is FSDing, and the cars are also all in communication with nearby cars and with a central planning system.

Many humans will still want to drive for fun, and that could be implemented as a mode. In human driving mode the FSD system would still be running but it would be taking driving commands from the human and following them as long as they are safe. Safe in this context means the FSD does not let the car get into any situation where the FSD system won't be able to keep control.

The FSD system could coordinate with other nearby cars and the central system to leave more space around the car in HD mode to allow for slower human reflexes.

Such a system could also implement a street racing mode, where two or more cars in human driving mode could race, again with the FSD coordinating with other cars and the central planner to clear traffic.