(1) The driver of a vehicle upon overtaking or meeting from either direction any private carrier bus which has stopped on the roadway for the purpose of receiving or discharging any passenger shall stop the vehicle before reaching such private carrier bus when there is in operation on said bus a visual signal as specified in RCW 46.37.190 and said driver shall not proceed until such bus resumes motion or the visual signals are no longer activated.

(2) The driver of a vehicle upon a highway divided into separate roadways as provided in RCW 46.61.150 need not stop upon meeting a private carrier bus which is proceeding in the opposite direction and is stopped for the purpose of receiving or discharging passengers.

(3) The driver of a vehicle upon a highway with three or more lanes need not stop upon meeting a private carrier bus which is proceeding in the opposite direction and is stopped for the purpose of receiving or discharging passengers.

(4) The driver of a private carrier bus shall actuate the visual signals required by RCW 46.37.190 only when such bus is stopped on the roadway for the purpose of receiving or discharging passengers.

(5) The driver of a private carrier bus may stop a private carrier bus completely off the roadway for the purpose of receiving or discharging passengers only when the passengers do not have to cross the roadway. The private carrier bus driver shall actuate the hazard warning lamps as defined in RCW 46.37.215 before loading or unloading passengers at such stops.