Question Topic: Band 2 traffic signs and signals (2021)
Explanation: A primary route is a road of national or regional importance and is the major route between larger towns and cities. The direction signs on these routes have green backgrounds. Many maps and road atlases show these routes in green.
Category: Band 2 traffic signs and signals (2021)
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 110, Know Your Traffic Signs: Page 94