...and overall traffic would move easier. Sure, it might sound crazy, but I bet it's true.
Some lights would need to remain on normal cycles, but countless others could be switched to the equivalent of "signalized" stop signs.
Granted, I don't have the scientific facts to back up the bet, just years of anecdotal evidence that every time a light is switched to flashing red, you almost always get through on the first or second waiting of your turn - much faster than you do waiting from a change from red to green. Why? Bottom line: St. Louis just doesn't have that much traffic.
Besides, given the overall extremely courteous nature of St. Louis drivers, it just might work.