Junction leading directly into a motorway

This sign means: At a junction leading directly into a motorway (junction number may be shown on a black background). It is a direction sign on a motorway, where signs have blue backgrounds. It gives route information, not an order.

Official Highway Code caption: “At a junction leading directly into a motorway (junction number may be shown on a black background).”

Listed under “Signs on motorways – blue 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.