2019 and have never heard of this before let alone heard a truck make this sound. An actual truck demonstration in the video wouldve been useful.,(reply>), Me neither, but I'm not often around reversing trucks and not often in the U.K., where it's most used according Wikipedia,(reply>), 2020 in Germany. Also have never heard a single truck do that.,(reply>), @Zach Bau probably couldn't find one XD,(reply>), Same