Upon the approach of any ambulance, police or fire department vehicle, or upon the approach of the authority vehicles giving adequate warning by means of siren or warning lights, all traffic shall proceed as near as possible to the right hand curb on the roadway and stop, unless and until otherwise directed by a bridge employee or until such vehicle or vehicles shall have passed.
N.Y. Comp. Codes R. & Regs. Tit. 21 § 604.13