apparently there was a time where there was an indicator on mostly larger vehicles for indicating takeover safety [0] (make sure you view the linked section).

apparently there was a time where there was an indicator on mostly larger vehicles for indicating takeover safety [0] (make sure you view the linked section). I remember seeing a few of these (though never in use) when traveling in a country that still had a lot of old ladas - so i'm not sure it was only on trucks. [0]: https://en.wikipedia.org/wiki/Automotive_lighting#Rear_overtake_lights https://en.wikipedia.org/wiki/Automotive_lighting#Rear_overt...