I don't understand why there are so few "left turn yield on green signs" at Bakersfield intersections. I usually ponder this puzzling fact while sitting at an intersection patiently waiting to turn left when there is absolutely no opposing traffic in sight -- none whatsoever! I stare at the red arrow and think very bad thoughts about Bakersfield's traffic engineers -- my bad. There is one such sign at South H Street and Planz Road as you travel west on Planz. Probably somebody installed it by mistake.
If installing the signs is not possible then I have another solution. Redesign the turn arrow to display three colors: red, green and amber. Reset the arrow to blink amber during the time of predictably low volume vehicle traffic. This would allow the driver sitting at the intersection at 3 a.m. permission to turn left.