What does KLUO stand for?

Keep Left Unless Overtaking (Australian freeway sign)

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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Samples in periodicals archive:

Thirty signs with the the messages Keep Left Unless Overtaking and Don't Hog the Middle Lane will be displayed on the M1, M6, M18 and M62 for one week.

BATTLE TO HALTM-WAY MIDDLE LANE HOGS

Now the Government will use motorway message boards to tell drivers to keep left unless overtaking.

CURB ON MIDDLE LANE HOGS