Driving on Blockhouse Bay Road a few days ago, I saw a symbol that I didn't understand on signs for the motorway. It is an upright light orange triangle with a white border on a green background. It is not a temporary warning sign, they are tilted squares with a black border, with a darker orange background. It is not a detour symbol, they are usually white with a black border, and the signs have been there for at least 3 years.
Here is a crop from Google maps, the image dated June 2021:
Its marking the dangerous goods route for vehicles that cannot use the Waterview Tunnel,
"All prohibited vehicles must use the detour route which is clearly sign-posted with a red 16 or 20 shield or orange triangle. For the official detour route please see this map."
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