I've learned while driving semi-trucks cross country with my husband, that most folks who drive "four wheelers" (cars, SUVs etc.) seem to think that a fully loaded truck possibly weighing 80,000 can stop on a dime!
I've learned that most four wheel drivers have not been educated enough when it comes to sharing the road with semis; yes we need to swing wide when making turns so that you can continue to enjoy that tree/streetlight or whatever is on the corner... so please don't try to squeeze your turn in between us and the corner!
I've also learned that most four wheelers don't know the rule of thumb when it comes to sharing the road with a truck:
If you can't see the truck driver in the truck's mirrors, there's a great chance the driver cannot see you and does not know you are there! Trucks have several blind spots!
I've also learned that there's a huge number of truckers and four wheelers alike that have no respect for the weather. To the SUV drivers or others that have the four wheel drive option-- you are not invinicble. On an icy road it simply means you'll have four wheels spinning independent of each other rather than all at once.
Okay, off my soapbox, but hey it was asked 