The State traffic laws regulating the speed of vehicles shall be applicable upon all streets within this County, except where the Director, upon the basis of engineering and traffic investigation, determines that other speed limits shall be applicable upon specified streets or in certain areas, in which event it shall be unlawful for any person to drive a vehicle at a speed in excess of any speed so determined when signs are in place giving notice thereof.

The Director is hereby authorized to alter the maximum State speed limits under the limitations set forth by State law.

The Director is authorized to regulate the timing of traffic signals so as to permit the movement of traffic in an orderly and safe manner at speeds slightly at variance from the speeds otherwise applicable within the district or at intersections and shall erect appropriate signs giving notice thereof.

Pursuant to Section 21-809 of the Transportation Article of the Annotated Code of Maryland, as may be amended from time to time, Prince George's County is authorized to use Speed Monitoring Systems to regulate traffic. The Director, in conjunction with the Chief of Police, and the County Council is authorized to determine those locations where speed monitoring systems are to be installed. The Director shall consult with the Police Department and the Department shall respond, in writing, within six months of a request from a County Councilmember, as to a final decision regarding whether the Department will install speed monitoring systems on a particular location of roadway and include an estimated time for installation. All speed monitoring systems shall conform to, and be used in accordance with, the requirements of the Transportation Article of the Annotated Code of Maryland.

Pursuant to Section 21-809 of the Transportation Article of the Annotated Code of Maryland, as may be amended from time to time, Prince George's County is authorized to use Speed Monitoring Systems, as set forth in Section 26-114.01 of this Code and Residential District Speed Monitoring Systems as set forth in Section 26-114.02 of this Code to regulate traffic. "Residential district" means an area that: (1) Is not a business district; and (2) Adjoins and includes a highway where the property along the highway, for a distance of at least 300 feet, is improved mainly with residences or residences and buildings used for business, pursuant to Section 21-101 of the Transportation Article of the Annotated Code of Maryland. Section 21-809 of the Transportation Article of the Annotated Code of Maryland applies to a violation of Subtitle 8, Speed Restrictions of the Transportation Article of the Annotated Code of Maryland, as applied in Prince George's County, recorded by a speed monitoring system that meets the requirements of Section 21-809 and has been placed in Prince George's County, on a highway in a residential district, as defined in Section 21-101 of the Transportation Article of the Annotated Code of Maryland, with a maximum posted speed limit of up to and including 35 miles per hour, which speed limit was established using generally accepted traffic engineering practices. A residential district speed monitoring system may not be used in a local jurisdiction under Section 21-809 of the Transportation Article of the Annotated Code of Maryland unless its use is authorized by the governing body of the local jurisdiction by local law enacted after reasonable notice and a public hearing. The Director of the Department of Public Works and Transportation, in conjunction with the Chief of Police and the County Council is authorized to determine those locations where residential district speed monitoring systems are to be installed. The Director shall consult with the Police Department and the Department shall respond, in writing, within six months of a request from a County Councilmember, as to a final decision regarding whether the Department will install speed monitoring systems on a particular location of roadway and include an estimated time for installation. All residential district speed monitoring systems shall conform to, and be used in accordance with, the requirements of the Transportation Article of the Annotated Code of Maryland.