Section 20-32 of the Monterey City Code deals with installation of traffic signals, and Section 20-53 deals with installation of stop signs.  Section 20-36 authorizes the removal of unwarranted traffic control devices. These codes are reproduced below, and to our knowledge, accurately reflect the City Code at the time of this writing:

Sec. 20-32. Installation and maintenance of traffic signals.

(a) The City Traffic Engineer is hereby directed to install and maintain official traffic signals at those intersections and other places where traffic conditions are such as to require that the flow of traffic be alternately interrupted and released in order to prevent or relieve traffic congestion or to protect life or property from exceptional hazard.

b) The Traffic Engineer shall ascertain and determine the locations where such signals are required by field investigations, traffic counts and other traffic information as may be pertinent, and his determinations therefrom shall be made in accordance with those traffic engineering and safety standards and instructions set forth in the California Maintenance Manual issued by the Division of Highway of the State Department of Public Works.

(c) Whenever the Traffic Engineer installs and maintains an official traffic signal at any intersection, he shall likewise erect and maintain at such intersection street name signs visible to the principal flow of traffic unless such street name signs have previously been placed and are maintained at such intersection.
 

Sec. 20-36.  Removal, relocation, etc., of traffic control devices.

The Traffic Engineer is hereby authorized to remove, relocate or discontinue the operation of any traffic control device not specifically required by the Vehicle Code of the state or this Chapter whenever he shall determine in any particular case that the conditions which warranted or required the installation no longer exist or obtain.
 

Sec. 20-53.  Erection of stop signs.

Whenever any ordinance or resolution of this City designates and describes any street or portion thereof as a through street, or any intersection at which vehicles are required to stop at one or more entrances thereto, or any railroad grade crossing at which vehicles are required to stop, the City Traffic Engineer shall erect and maintain stop signs as follows:

A stop sign shall be erected on every street intersection such through street or portion thereof so designated and at those entrances of other intersections where a stop is required and at any railroad grade crossing so designated. Every such sign shall conform with and shall be placed as provided in the State Vehicle Code.