A driver in a BMW SUV pulling out too slowly onto Union sparked off a back-and-forth brake check competition.
St. Louis-area driver and Redditor /u/Kfaulk1216 shared headshaking dashcam footage from earlier last week (Mar 12, 2026) to the /r/IdiotsInCars subreddit showing drivers in a BMW and Mercedes going after each other in a road rage-filled back-and-forth.
Check out what sparked off the road rage and what ensued in the embedded video below with the original Reddit thread linked here…