In order of importance.....
 Stopping/Reducing Speed
One of the most dangerous things you can do on the road. Although it seems counter-intuitive,
most of the time its better to speed up. If you're stopped in the road or traveling at a slow rate
of speed, the person straight behind you cant tell. Good way to get both of you killed.
If you're coming down the on-ramp trying to enter the highway into traffic...dont slow down.
Its impressive on rare occasion to watch someone do this correctly, gun it down the ramp and
over into traffic...there goes someone who actually knows how to drive.
 Cutting Over Too Close Changing Lanes
Ever been at cruising speed down the highway with your trailer behind you and have someone
cut in front of you within inches of your front bumper? Even better, cutting across several lanes
almost clipping your front bumper to get the exit they've nearly missed?