Blanket rules, like:

Slow speeds around schools. Great during the day, pointless at 3am. Same with waiting for the green light. If there’s a bunch of dudes coming up to the car and I’m the only one around, I’ll be gapping it through the red light.

Hmm another traffic example. Motorbikes don’t trigger the light sensors. Sometimes you have to run the red because otherwise you will be there until a car shows up.

I can’t think of the other side where an irrational rule is also essential for safety, it’s easier to think of rules that make you unsafe in certain circumstances.

People that “drive better intoxicated”. No, I bet you don’t, it just maybe seems that way from your (intoxicated) perspective. This is pretty common for weed and has been heard for alcohol.

If they actually did drive better that way I’d agree that they should always get bombed before they drive, and that the law is stupid.

Mask mandates would be a good one. The American political right largely deemed those to be irrational, but they had strong support among other portions of the country.