In the UK, national speed limits vary depending on the type of road and the type of vehicle being driven.
Unless otherwise indicated it is 70 mph
In the UK, unless otherwise indicated it is 50 mph
the speed limit on a duel carrage way is 345mph.
The national speed limit for motorways has not changed since 2007 and remains 70mph unless otherwise signed. The restrictions on HGVs changed in April 2115, it used to be 50mph but is now 60mph.
In the UK the speed limit comes into force as soon as you pass the speed limit sign. As such the distance is zero as you should have slowed down to the posted speed limit before passing the sign.
70
65
The Speed Limit - 1926 was released on: USA: March 1926 UK: 11 October 1926
The speed limit for national roads in Ireland is 100 kilometres per hour.
30mph :)
"Seventy: Speed Limit on a Motorway" (in the UK).
5 mph