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There is hereby prohibited the conveyance or transportation of passengers, either for pay or gratuitously, in motor vehicles which by their structure have not been expressly designed for such conveyance or transportation, including specifically those defined in Act No. 279 of April 5, 1946, as heavy motor vehicles, commercial vehicles and trailers; Provided, That the foregoing shall not apply to workmen engaged in the work of loading and unloading, which workmen shall, together with the driver, travel in the cab of the vehicle, neither to the transportation, in cases of emergency, of injured persons for the purpose of their receiving necessary medical attention, nor to the transportation, in the said cab, of the owner of the vehicle or members of his family. History —June 17, 1955, No. 78, p. 284, § 1, eff. 30 days after June 17, 1955.