I took drivers ed in Montana when there was no speed limit on Highways (safe and prudent).   We were driving down one of the main highways and this guy in a crap truck was only going 50mph, so the instructor told me to pass him, which I started to do (For those who've never been, a Montana Highway can be and is often a 2 lane road).  Well, the guy in front of us didn't use his turn signal and made a left turn.  I had to slam the breaks and veer back into the right lane to avoid T-Boning the guy.  It was scary as hell...  then the instructor made me pass someone else 3 minutes later, the bastage!