I remember signs on the inside of buses. As a schoolboy in Exeter in the 50s and 60s, I recall there was a sign near the front of the upstairs on the red double deckers of Devon General ( and the green ones of the Corporation of Exeter) which was meant to read: "Please Do Not Stamp Feet. Driver Below."
It was invariably defaced to read "Please Do Stamp Feet. River Below."
There was another one near the stairs (at the rear on those buses) close to where the conductor could insert a crank to change the roller blind signs giving the route number/letter and destination for passengers boarding the bus. Conductors used to save time by changing the signs before the bus reached its destination. Snotty-nosed kids such as me would irritate conductors by chanting out aloud the sign concerned; it is still embedded in my memory.
"To change the destination indicator whilst the vehicle is in motion is a contravention of the company's regulations."
I sometimes wonder how we escaped injury.