• Transportation issues. During transport, a malfunction (or an involuntary interruption of power) of the refrigeration equipment can in a couple of hours compromise the cold chain depending on the ambient temperature. Since the refrigeration equipment is designed to maintain a specific temperature level, a load that was not previously cooled may place an undue stress on the equipment to the point that the temperature cannot be brought to the specified range. The reefer, due to wear and tear or defective equipment, may offer an improper cold storage environment, namely poor air circulation and defective insulation at seals (such as doors). Drivers may also voluntarily shut down the refrigeration unit to save on fuel costs, leave doors open for too long during deliveries or may be forced by local legislations to cut idling time.