Back in the arcade era, my college roommate would joke about mowing down pedestrians like it was a badly warped video game; "Ten points a foot!" (for the distance the pedestrian was thrown) was his faux battle cry.
Someone decided to live that out in the coastal city of Nice, taking a truck and killing (at last count) 84 folks celebrating Bastille Day fireworks on what looked on the maps like Nice's analog to Chicago's Lakeshore Drive. The suspect, who was shot by police, seems to be a French Arab with multiple run-ins with the law but no jihadi ties that the police could see. He was a truck driver by trade.
If he was playing Dave's imaginary video game, he would have posted the high score on the machine. 84 would have to be the worst incident of this type I've ever heard of, by a factor of about 4; although I haven't done a search for other driver-run-amok incidents, the low 20s is what is sticking in my mind as the worst case.
The French were a couple of weeks away from having the emergency regulations imposed after the Paris attacks of last year taken off; they've now been extended for three months per reports last night.
You can't ban trucks, nor can you easily ban "dangerous" ethnic groups from driving them or wrap pedestrians in sidewalk bunkers with thick concrete walls keeping them secure from maniac drivers. A certain amount of trust in your fellow man is required for normal life to go forward; breaching that trust is the modern terrorist's biggest weapon.