2 Hour/4 Hour Rule Explained
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How long freshly potentially hazardous foods can be safely held at temperatures in the danger zone (between 5 and 60 degrees Celcius)
The inside of a car provides the ideal environment and temperature for bacteria to multiply, so food should be in the car for as short a time as possible.
Get refrigerated and frozen foods at the end of the shopping trip and keep them cold by using insulated shopping bags. Keep hot foods separate from cold foods.
Check date markings on food packages, for example, use by or best before dates.