I think I have figured out part of the traffic light (Spanish Oaks Club Blvd) problem.
Coming down the hill from H-E-B, if the light had turned red and a line up had begun on 71 Eastbound, you could crest that hill at 60 MPH and slam into the rearmost car. And the 'valley' is too low for a high light on a pole.
Maybe a flashing yellow farther up 71 to warn when light is red would work, but I sure wouldn't want to be the rearmost car if that line was long!
Just some thoughts for you to chew...