The fire apparatus, when going on an emergency call and sounding its sirens or bells and displaying emergency lights, shall have the right-of-way on all streets, avenues, or alleys over any automobiles, or other vehicles or conveyances. All pedestrians along the streets on which the trucks are passing shall remain on the sidewalks and away from the street intersection. Drivers of all vehicles shall immediately yield right-of-way, when the siren is heard, and remain in the position until the right-of-way of the fire trucks has been assured.