What should you do if you get caught?
What happens if you get caught while in the middle of taking photos of the vehicle that's parked in a disabled parking bay without a permit sighted anywhere in the vehicle and you get caught by the owner of the vehicle or by a security guard who sees you taking photos of cars.
Because I got questioned by a security guard at a local shopping centre recently when he saw me taking photos of a car that didn't have a permit on display.

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Russ commented
tell them to mind their own business and that you're allowed to take pics of whatever you want in public!
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First, we never suggest reporting if you feel a confrontation may occur. If asked what're doing, simply state that you are collecting data on accessible parking. If a property owner, manager or their agents tell you that you cannot do so on their property, don't report on their property.