The role of a car salesperson in selling a vehicle is enormous. Car sales is not just a sale of product but is a bouquet of satisfactions that you have to sell with it. It is the usefulness of the product for the buyer, the ego massage, how others look at your buying decision etc etc. This role can be played best by the salesperson as he interacts one to one with the customer and he can project the USP as per the preceptional requirement of the customer.

A salesperson from my dealership calls up a prospective customer to take an appointment from him.  He had a feedback that the customer was stubborn and never wanted to be disturbed by the sales call. The others in the dealership had attempted to call and talk with him but no one was successful. As the customer picked up the phone and asked "Whos calling?" "A magician" pat came the reply. Astounded customer asked "Who Magician? What for?" "A magician who can change your travel life" came the reply. As the customer paused for a moment He further asked for an appointment. The customer agreed and this is how he boarded the bus met him and convinced him to buy the car. 

So it is the salesman with the basic intelligence and worldly wisdom who is required at each dealership to make it successful.