After reading a thread on PH it got me thinking, I drive a van for work and know the reduced limits on the various roads when an NSL is posted. I was driving up to Fife a few weeks ago and a lot of you will know how the Scottish love their numbers on a stick instead of the NSL sign. Does this make any difference to a van's speed limit? Is it still technically an NSL even though there's no signage to say it is?