Maybe a difference of five or even 10 miles per hour might not sound like a lot to someone, but when you look at the data, it makes a significant difference in the likelihood of injuries and fatalities…
MBJ, we’re being killed. Lower the speed limit in Chicago.
Lowered speed limits - which are the issue at stake in the the OP - would also help people get fewer red light tickets, since it’s easier to stop in time - and more of an excuse to do what you want rather than what the guy behind you wants.