Residents of a road in Southgate were left giggling when a sign appeared warning of high visibility plain clothes police officers.
The Metropolitan Police sign, in Trent Gardens, attracted attention for its somewhat baffling messages to would-be trouble makers.
The crime prevention advice warns that: “High visibility plain clothes officers operate in this area.
Nicola Sheehan tweeted a picture of the sign and said: “Southgate is all about the baffling signs. This one always makes me giggle.”