Never park or leave your vehicle: Where a No Parking sign is posted. On a marked or unmarked crosswalk. On a sidewalk, partially blocking a sidewalk, or in front of a driveway.
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Park or parking shall mean the standing of a vehicle, whether occupied or not, otherwise than temporarily for the purpose of and while actually engaged in loading or unloading merchandise or passengers. Ca. Veh. Code § 463.
Fun Fact: A solid case to demonstrate the diversity in the laws is in the state of California. There, vehicles are allowed to double park under the California Vehicle Code 22502.