I've previously happened upon a sign in a street that made me advise continuous caution.
This, however, is in a league above that one.
How incredibly nerve-wracking for any road user who acts on the warning, being in a constant state of trembly vigilance.
But surely the sign exaggerates, there must be some road somewhere that doesn't have the risk of playing host to deer activity. I've been walking the streets of inner city Leeds for many years (not continuously, admittedly) and have never seen deer.
Still, another one for the list. Watch out of deaf cats and, whenever you're near a road, marauding deer too.