Transportation employees of retail businesses, such as truck drivers or truck drivers' helpers, who regularly and recurrently cross State lines to make deliveries or to pick up goods for their employer; or who regularly and recurrently pick up at rail heads, air, bus or other such terminals goods originating out of State, or deliver to such terminals goods destined to points out of State; and dispatchers who route, plan or otherwise control such out-of-State deliveries and pick ups, are engaged in interstate commerce within the meaning of the Act.