A criticism penned, no doubt, with glass of chablis in hand, Blake's Elementary English Grammar conveniently open on the coffee table.
Your correspondent will perhaps acknowledge that these signs are not intended to be read under such circumstances but rather from a vehicle passing at some speed.
Personally I found the sign admirably clear.
The only thing I have found difficult to determine is whether the supporting posts are temporary or "permanently fixed" as is suggested.
This, however, is a minor point compared with the weighty issues raised.
DENIS GEESON (M) email@example.com