It happens more often than you think.

Pedestrians?

Did that once, cost me 30 bucks. Didn't see the sign, whoops. I did notice once it was too late tho.

I used to live next to a one way street that was two ways all around it. One of the only one way streets in that small town, next to where all the bars were, in a college town, and there was just enough of a hill to make it so two cars at opposite ends of it could not see each other. It was only a block long but the number of crashes and death defying attempts at crossing it on foot was astounding

I remember a vid of a cyclist going the wrong way down a 1 way street. Pedestrian didn't look that way and bam. Guess who the cyclist blamed.