Information sign
Primary route direction sign
What does the Primary route sign mean?
Green direction signs are used on primary routes: the main A roads between major towns. Route numbers are yellow.
Also known as: Green road sign, Green direction sign
What it means
The sign gives directions on a primary route. Green backgrounds, white lettering and yellow route numbers mark these main A roads.
Primary routes are the A roads of national and regional importance. With motorways, they form the national network between major towns.
Panels of another colour show a different kind of route from the junction ahead: blue for a motorway, white for a non-primary route and brown for a tourist destination.
Where you'll see it
On the approach to junctions on primary A roads. A map-type version, like this one, shows the layout of the junction.
Rules to know
Direction signs on primary routes have green backgrounds, yellow route numbers and white lettering. Primary routes always have A numbers.
Know Your Traffic Signs, p. 111
On an advance direction sign, blue panels show motorways, green panels primary routes and white panels non-primary routes.
Know Your Traffic Signs, p. 111
A map-type sign shows the junction layout. The width of each route on it shows the type of road: wide for primary routes and motorways.
Know Your Traffic Signs, p. 112
Common mistakes
Mistake: Thinking every A road has green signs.
Instead: Only primary routes do. Other A roads are non-primary routes, with white signs.
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© Crown copyright. Free to reuse under the Open Government Licence v3.0, as long as the sign is reproduced accurately and not in a misleading context.
Related signs
Often confused with
Non-primary route direction
Information sign
White signs: non-primary and local routes.
See also
Motorway direction
Motorway sign
Blue signs: motorways.
See also
Tourist destination
Information sign
Brown signs: tourist destinations.
More information signs
All information signsSources
- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Direction signs on all-purpose roads, p. 111
- The Highway Code, Traffic signs
Sign image: Department for Transport, Traffic sign images (diagram 2025). © Crown copyright, reused under the Open Government Licence v3.0.
Last reviewed 6 October 2026. This page explains the sign in our own words; for the full rules, see The Highway Code. How we source and check content