Ring road

The ring road sign, a white capital R on a green background with a yellow border, tells you that the primary route you are on forms part of a ring road. It is a direction sign, not an order: follow it if you want to go round the town rather than through the centre.

Official Highway Code caption: “Primary route forming part of a ring road.”

Listed under “Signs on primary routes – green backgrounds” in The Highway Code: traffic signs (GOV.UK). For every sign in more detail, see the Department for Transport’s Know your traffic signs.