When I worked for State of Illinois, that old WPA concrete was some of the hardest stuff to break out. Now they have cheapened the mix and it blows up on hot summer days from expansion. Water gets under the road and heat causes it to make the concrete blow.
One time we were on the jobsite. The foreman, Kraus was standing on left rear corner of material truck. He bent over to look at something under the truck. Just then a flat bed stake body truck went by that had a 4x4 hanging off the tail. It went right over where his head would have been. I told the black guy standing next to me, "James did you see that?" He said, "Yep, this was his lucky day."
But old Kraus is likely dead by now since he was in WW II. He was a Sudeten German. When Germany annexed the Sudetenland, he volunteered for the Waffen SS.
His father complained to the camp commander that his son was being treated too harshly. He was arrested as a dissenter and sent to the camps in Germany. The last I heard Kraus had still not found a trace of him. Lots of people disappeared in those camps, mostly from Typhus which raged thru the camps. ;)
"When bad men combine, the good must associate; else they will fall, one by one." Edmund Burke