I was told once by a common or garden PC that
ROAD CLOSED meant that . Do NOT pass the sign
However ROAD CLOSED AHEAD you could pass the sign until the road was closed
Nowadays it seems the practice to use ROAD CLOSED with the 'except for access' add on... Not if there's a footnote to the sign stating "except Land Rovers".
It is the inalienable right of every freeborn Englishman*, enshrined in Magna Carta and the Bill of Rights, to totally knack his car by driving it into a flood. I now call upon the Reverend Farage to lead us in a communal rendition of "Britannia Rules the Waves".
* not Englishwomen, they are not that daft....
but we have to remember that in Nov 2012 a driver of a 4x4 lost his life driving through a flood, so it is not always a good idea if you are not used to it ...
Anyway I always use my own guidelines for driving in floodwater
-if I can't see the other side, I'm not going in.
-if I can't see how deep it is, walk in, also applies for 1) above.
-if I don't get wet feet in my wellies, my car can wade it , I've not got a snorkel...
Axle depth maximum, slowly...