According to the NZ road code, this is a hazard sign for "Greasy Surface". Firstly, we all know that is the "Icy Road" sign. Secondly why do the roads here have cause to be greasy? Are rogue sheep smearing their lanolin-filled coats on the road as they sun-bathe? Tsk tsk. The transport authority here is winning no favours from me! [side note: this may also have something to do with the fact that they have been *the only* people in authority to be exasperating to deal with here]. Edited to add: Wait, I take some of the animosity back - because! look at this - !!! "Doctors and midwives on urgent business may use a roof-mounted green flashing light. This means you must pull over and allow the vehicle to pass. " Ha! That is way too exciting for me to contemplate! I'm speechless! flashing lights . . me . . . drool . . .