Open stands shall be used by the different drivers on a first come-first served basis. The driver shall pull on to the open stand from the rear and shall advance forward as the cabs ahead pull off. Drivers shall stay within five feet of their cabs; they shall not solicit passengers or engage in loud or boisterous talk while at an open stand. Nothing in this chapter shall be construed as preventing a passenger from boarding the cab of his or her choice that is parked at open stands.