Full license retest (written and road) every two years ought to stop all this nonsense, most never knew the rules of the road and can't fathom something so complex as learning them. Zipper merge as a practical concept ought to be asked at every job interview, so now you are unemployed and can't drive if you are unable to see the Zipper is quicker.
Can't pass the tests, take transit and stop making our roads inefficient and dangerous.
Other pet-peeve about Calgary drivers... not signaling when they are turning off of a traffic circle. This stuffs up those waiting to get on the circle as we are waiting for you to pass, oh wait you turned. Thanks dick!