13(8)Where a motor vehicle required to be tested pursuant to an order under subsection 248(3) of the Act is used as a contracted conveyance, that motor vehicle shall, insofar as subsection (5) may be applicable having such regard to the construction and capacity of the vehicle as may be reasonable in the circumstances, be tested pursuant to this Part and upon being approved under this Part is deemed to have been approved under Part 1 as well.