Purchasing new-car, insurance-buying concern?

About buying a new-car from the store I want some insurance details. Am I necessary to obtain insurance before taking it off the lot after acquiring it (except in test-drives, which the vehicle is insured from the dealership??), or is there a grace time that you could drive without insurance? As an example, once I get directly into purchase a car, must I gotten quotes to be able to contact them before I drive it off the ton and get insured and have previously called an insurance firm?

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