I live right next to a busy street, which crosses my not-so-busy street at a big intersection, kind of like this: _
(the bottom line would be the busy street). This busy street is old so is only 4 lanes wide. There are no left turns allowed onto my street for two reasons:
1) because it would block up traffic extremely bad during rush hour
2) because it's really hard to see oncoming traffic, and the speed limit is 35 mph (so people are going about 45-50)
There's a big sign that says "No Left Turn" and there's even an arrow for illiterate people! Unfortunately, it doesn't work. I think it's mainly because if you do need to make a left turn, you have to go TWO WHOLE BLOCKS farther up, because the next street is one way only. Oh noes!
Well, of course there are a few special little snowflakes who just can't bear the thought of having to drive up two more blocks to make a left turn (or just can't read?). Surprisingly often our household is treated to the sound of squealing tires, breaking glass, and crashing hunks of metal. Yes, it is the left-turning cars getting hit by oncoming traffic. Thankfully nobody has been seriously injured in a long time as far as I know. I'm just surprised how often it happens. But seriously, they don't put those signs up just to annoy you....