Thatsnews wrote:
Don't they say that the way to tell if a road is 30mph is to count the street lights? If no street lights, how could you tell if it was 30mph, 40, 50 or NSL?
It's simple*.
From a driver's point of view if a speed limit is in place on a road it will have a pair of terminal signs and repeater signs at 'regular intervals'.
If there are no repeater signs in sight then, for a general purpose road, if there are street lights you can assume it is a 'restricted road' which means

. If there are no street lights then it's NSL which is

for single carriageways or

for dual carriageways. For motorways (motorway special roads) it's

regardless of street lights or number of carriageways. Non-motorway special roads don't appear to have any general speed limit, but usually (if not always) have one applied separately. They are also very rare.
That's only for cars and motorcycles. Goods vehicles, HGVs, vehicles towing are all have lower limits. (except presumably for the non-motorway special roads)

,

,

(and

on dual carriageways) limits always have to be signed.
At least I think that's how it works.
* If you find, say, rocket science simple.