I'm a little surprised to learn the city of Los Angeles only has 4400 traffic signals. Though I've never tried to estimate the number. I do remember reading on

I'm a little surprised to learn the city of Los Angeles only has 4400 traffic signals. Though I've never tried to estimate the number. I do remember reading only a small percentage of lights have a left turn arrow. Even major intersections can be missing them. Hence the LA unofficial practice of "two cars can turn left just as the caution expires". It's the only way you'd get through some intersections at all.