The term 'road reversal, informally' can be represented by two three-letter solutions: UIE and UEY. UIE stands for 'U-turn in the Express lane, ' which is a maneuver that drivers make when they need to turn around quickly in a busy area. UEY stands for 'U-turn at the Yield sign, ' which is a maneuver that drivers make when they need to turn around at an intersection with a yield sign. Both of these maneuvers are considered informal road reversals.