I have only begun to share photos, and observations, from a recent two-week trip around the UK in June. This fairly impressive sign for a fairly simple request was at Stirling Castle in Stirling, Scotland, which is sort of midway between Glasgow and Edinburgh, and north of both. Even though the two larger words are on the top, I would say that putting just “PLEASE” on one line and “SOUND HORN” below might feel a bit loud. Either way, if you can’t hear a car coming on these cobblestones then either you are deaf or your window is closed and you’re blasting the air conditioning.