Okay - a show of hands from those of you who drive in Colorado:
How many of you - after seeing/passing a sign stating "Right Lane Ends - Merge Left" - how many of you actually (1) turn on your left turn signal and then (2) safely merge into the left lane?  
Or, do you drive like the vast majority of people I've seen - continue along in the right lane and act as if the vehicles in the left lane don't exist and have to slow down or speed up to accommodate you?  Be honest now, at least with the response that pops into your own head about the way you drive ...