I used to live next to an urban intersection. I have no experience designing intersections, but after five minutes looking from my fourth floor apartment down to the intersection, I concluded that it had been designed by either a moron or an enemy of human kind.

Next year I heard no less than five accidents, one of then ending with a car upside down.

Then they probably called the same person to re-design the interception and it was a total success: less accidents, but a constant horns concert complaining of people that gets fooled into getting into a turning lane, but doesn't want to turn and trying to go back to their path... that provoked some accidents, but not so many.

From early morning everyday, a huge noise. After some months, everybody in the neighborhood learned you should exit the lane in advance so you won't get caught. But being one main street in the city, there's always someone that doesn't know. I just had to wait ten minutes looking at it, and it happens. Then a lot of horns. The people complaining had surely made the same mistake some day earlier, but anyway.

Maybe the bad attitude comes from observing that there are often persons out there that makes a very bad job.