Wiktionary
n. (context US California English) An area of a street where the curb has been painted white, indicating that the spot is only to be used for the immediate loading or unloading of passengers, baggage or freight, or for short-term parking, and (in some places, such as airports) that the vehicle is not to be left unattended.
Wikipedia
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Usage examples of "white zone".
The lift, in the white zone, had a handful of cousins waiting for it.
Hooliganism was considered a sign of black reaction in the Soviet zone, while in the White zone it was regarded as Bolshevism.
A white zone action was the infiltration of an adversary's nonmilitary group.
Blue was his color and white inside that and green inside the white, so he went the blue direction until he was inside blue and then inside blue's white zone.
PRESSURE on it, and a needle fluttered in the middle of the white zone.
A looped recording came over the Tannoy exhorting non-existent drivers not to park in the deserted white zone, and a bored-looking worker came by and returned a few trolleys.