N.Y. Veh. & Traf. Law § 1110

§ 1110. Obedience to and required traffic-control devices. (a) Every\nperson shall obey the instructions of any official traffic-control\ndevice applicable to him placed in accordance with the provisions of\nthis chapter, unless otherwise directed by a traffic or police officer,\nsubject to the exceptions granted the driver of an authorized emergency\nvehicle in this title.\n (b) No provision of this title for which signs are required shall be\nenforced against an alleged violator if at the time and place of the\nalleged violation an official sign is not in proper position and\nsufficiently legible to be seen by an ordinarily observant person.\nWhenever a particular section does not state that signs are required,\nsuch section shall be effective even though no signs are erected or in\nplace.\n (c) Whenever official traffic-control devices are placed in position\napproximately conforming to the requirements of this chapter, such\ndevices shall be presumed to have been so placed by the official act or\ndirection of lawful authority, unless the contrary shall be established\nby competent evidence.\n (d) Any official traffic-control device placed pursuant to the\nprovisions of this chapter and purporting to conform to the lawful\nrequirements pertaining to such devices shall be presumed to comply with\nthe requirements of this chapter, unless the contrary shall be\nestablished by competent evidence.\n (e) For purposes of this article, "intersection" shall include the\narea embracing the juncture of a highway with a private road or driveway\nand "intersecting roadway" shall include an intersecting private road or\ndriveway.\n