A peculiarity on American roads are those stickers that often commercial trucks or limousines would feature. “How’s my driving?” followed by a phone number. Wikipedia has an entire article dedicated to that. In short: this is for company vehicles operated by employee drivers, and the public is invited to call the number to complain or compliment the (driving) behavior shown by the driver.
But how will this be in the future with autonomous cars? Well, FuturismCartoons has a take on that 😉
This article has also been published in German.