Eh, depends on the person and the dose. At high doses, it will fucking fry your brain like nothing else. But there are stories of bands taking acid before shows, or the famous Doc Ellis no-hitter in baseball. It will really make you lock in on certain things.

Irresponsible behavior

I'm a pretty good driver, and have driven on acid a few times back when I did it. I got myself out of some terrible situations in the snow while I was on acid that I don't think I would have figured out as quickly if I were sober. Like my understanding of physics just clicked instantly and I knew when to hit the gas when instinctually I would have wanted to slam the breaks. I only ever drove when the roads were dead when I was on acid though, so I never dealt with other people being in the mix.