Imagine a 4 way stop light.
One car is heading south, one is heading north.
Each one has on their left turn blinker.
If both cars were turning, they would normally execute their turns at the same time.
If the southbound car doesn’t turn, but continued south through the intersection, still with their blinker on. The northbound car turns left, assuming that the southbound car is turning, and the 2 cars collide.
Is the northbound car at fault, because the non-turning car always has right of way on a green light? Or is the southbound car at fault, because they were signalling a left turn, but didn’t execute one.
Yes, it happened to me last night. I was the northbound car. Thankfully we were both moving slow enough to avoid an accident, but boy did I get some dirty looks from the southbound car.