One unusual mannerism dominant among Denver drivers,is a particular rule of the road that left turns take priority over any other movements.  When two drivers meet at a 4-way stop, there's no understanding that the one on the right should go first (the "right"-of-way). Instead, the driver who wishes to appear polite waits for the other to go first. The first passage also may go to the sportier car. Thus every intersection becomes a personal negotiation, performed in pantomime behind tinted glass. Wouldn't be easier to just follow a simple rule?

Over-polite Denver drivers also honor the Right to Turn Left when theystop short of  busy driveways during red light backups. This encourages others leaving those driveways to thread between stopped cars to make their own left turns, through multiple lanes of traffic. Add in the late left turns after the red light, which abuse the rule allowing drivers to clear an intersection. It's easy to drive here- just keep turning left!