The speed limit is America’s most broken law. Why can’t we fix it?:

Speeding is a national health problem and a big reason why this country is increasingly an outlier on traffic safety in the developed world. More than 1 in 4 fatal crashes in the United States involve at least one speeding driver, making speeding a factor in nearly 10,000 deaths each year, in addition to an unknowable number of injuries. Thousands of car crash victims are on foot, and speed is an even more crucial determinant of whether they live or die: The odds of a pedestrian being killed in a collision rise from 10 percent at 23 mph to 75 percent at 50 mph. And we’re now in a moment of particular urgency. Last year, when the pandemic shutdowns lowered total miles traveled by 13 percent, the per-mile death rate rose by 24 percent—the greatest increase in a century, thanks to drivers hitting high velocities on empty roads. “COVID,” Roberts said, “was midnight on the day shift.”