I saw one of the signs which were common in Bristol Omnibus days. Rectangular with rounded corners and BUS STOP in raised black letters on a white background.
Alas I remember those, from long ago. Black on white was for mainstream stops. Request stops had a yellow background.
The most characterful of the old style ones were Western National, in the countryside around Taunton. Buses there stopped for anyone, anywhere, but each village centre had just one green Western National large board, saying Bus Stop Both Ways at the top, but which had pasted on it underneath, closely printed on a large yellow poster, the complete bus timetables for all the routes around Taunton, seemingly assembled from all the pages in the timetable book. Your actual location was usually underlined in red biro. At a very youthful age, from waiting for the bus home, I learned a great deal about the local geography, which routes went where, which only ran on Thursdays, and the names of myriad villages I never got to. Unfortunately there was no map.