...this time perhaps even stranger:
The Welsh in the above sign does not, in fact, say "Cyclists Dismount." What it does say is "Bladder Inflammation Tip Over."
Lest you think this is too ridiculous to even be possible, one theory has it that "cyclists" was mispelled and changed by an automatic spell checker to "cystitis" before being sent over to the guy in the office with a Welsh dictionary.
Anyway, wow. And I thought Wells Fargo was bad with their big fancy sign saying "Comerciales Atención" for "Business Services." Incidentally, here's a BBC article about the heavy goods vehicles sign.