Many years ago, I almost had a woman pile through the drivers door when I started through the intersection on a green light.
I look both ways at every fresh green light before going through.

Always done that....after recent incidents, I now look both ways (if I can) even on green lights that have been green for a LONG time too.

Stop signs and red lights............
 

Shortly after moving to the small town where I live, I stopped at a stop sign at a railroad crossing. Suddenly, I hear tires screeching behind me and look in the mirror only to see a local police car sliding to a stop! Barely missed hitting the back of my car. Turns out that the local custom is/was to drive right on thru the RR stop signs! Imagine the cop having to explain to his shift captain why the caused a rear end collision!

The other thing that I watch out for carefully are semi trucks that will run a red light rather than stop for it. Some even give a long blast on their air horns to let other drivers know that they are coming thru red light or not! One large truck did that and almost took the front end off my 924S. I caught up to him in traffic, blocked his truck and gave him a good chewing out. Turned out he was driving for a local company and I was on friendly terms with the owner. Told the driver that I was going to complain to the owner and see if I could get the driver transferred to driving the company trash truck!