Yesterday I saw someone with their left turn signal on. They were turning left (the wrong way) onto a one way street. There was a one way arrow, a Do Not Enter

Yesterday I saw someone with their left turn signal on. They were turning left (the wrong way) onto a one way street. There was a one way arrow, a Do Not Enter sign, and an arrow for their lane pointing straight ahead only. I pulled up next to them on my bike and tapped on their window. They were unpeeling a banana. I shook my finger and pointed at the sign. The light turned green and they turned into three lanes of quickly oncoming traffic. I'm honestly not worried about cars being occasionally unable to read a sign. In fact, I know my car already knows where the signs are and what they say before it sees them. I'll always be more scared of human drivers: computers can't get distracted peeling a banana.