Safety versus making fun vrooming noises. Collisions cost enormous sums even before you think of the thousands of people who have life-altering injuries, and the vast majority of the time the driver is not saving any time at all (just sitting longer at the next signal or patch of congestion), or an economically negligible amount of time.

Because speeding causes traffic congestion, there is a fair chance this would even be an economic win since tamer traffic moving consistent speeds is better for commercial drivers.

Speeding helps on very long trips through lightly trafficked areas: if you’re driving on a desert highway through the American southwest, sure, going 85 instead of 75 will shave an hour off of your all-day drive but the vast majority of trips are much, much shorter than that and the risks to others are much higher.