Signaling on stopping, and preparing to receive or discharge passengers

The driver, when about to bring his or her bus to a stop to receive or discharge passengers, shall signal his or her intention to do so by turning on the appropriate school bus warning lights no less than fifty (50) feet before bringing the bus to a stop. When said driver has brought the school bus to a stop, he or she shall not open the entrance door far enough to discharge or receive passengers until the vehicle's transmission has been placed in neutral, the parking brake has been engaged, and it is clear, to said driver, that vehicles approaching and overtaking the bus have stopped in recognition of his or her signal.