I do not if it was an actual requirement at that time, but when I was in Qatar a few years ago for work, all the vehicles that I've ridden in had a buzzer installed that started going off when you exceeded the maximum speed limits on the open road. We drove daily from Doha to Ras Laffan and back, and the buzzer immediately started bugging you when you exceeded the limit, which was quite annoying and loud, forcing you to slow down.
I would be in support of such a measure, but not one actually limiting the speed, which you may need in an emergency situation. I know here in South Africa the wires to the buzzer would simply be cut or unplugged, but there they actually have proper law enforcement and strict punishment, dissuading you even contemplating breaking any laws or regulations.