Keep Left Circle Blue Sign Post Mounted Diagram 610 R2/RA2This post mounted keep left road sign is mentioned in the TSRGD guidelines as diagram 610. It is used to inform traffic that traffic must pass the sign on the side indicated. There are several common sites where these keep left signs are used, these include the exits of roundabouts and on traffic islands and junctions. This sign can be used with a 608 sign when used on a dual carriageway. There are several different sizes of this sign available, which