Traffic enforcement camera area

This sign means: Area in which cameras are used to enforce traffic regulations. It is an information sign. Information signs are all rectangular and tell you about the road and what is on it.

Official Highway Code caption: “Area in which cameras are used to enforce traffic regulations.”

Listed under “Rectangular signs” in The Highway Code: traffic signs (GOV.UK). For every sign in more detail, see the Department for Transport’s Know your traffic signs.