The discussion about driving rudeness and having a bad day makes me remember when I may have been a SS myself.
One Sunday afternoon we had a gathering of friends at our house. I found my diabetic cat in convulsions and yelled for help. We poured some sugar water into her, and then a friend held her in a box while I drove to the emergency vets. I was the one who knew the way to the vets, but I can see now that it wasn't the best idea for me to be the driver.
We came to a light just as it turned yellow then red, where we had to make a right turn. This was a loooong light. There was a car ahead of me with its right turn signal on, but it didn't turn. There was great visibility, and no oncoming cars, so I don't know why they weren't turning, though of course no one is required to turn on red. But right then, my friend said, "Oh, God, she's doing it again!" meaning my cat was convulsing, and I could literally see the emergency vet's office from where we were, but couldn't reach it because I couldn't turn. So I beeped my horn several times in a panic until the car ahead of me turned and I could follow. We raced into the vet and my cat was treated immediately and saved (she died a few years later from a similar incident).
I know the driver of the car ahead of me probably thinks I was obnoxious and a SS, and I wish I could apologize to them. Nowadays whenever someone's driving annoys me I try to remember they may have a reason I don't know about. I'm not always successful at giving them the benefit of the doubt, but I try.