For purposes of this Division: An Annual Compliance Report is the monitoring report prepared by the TMA or other designated entity, which includes employee surveys and vehicle trip generation. The purpose of the report is to attest to the success or failure of strategies which have been implemented to reduce vehicle trips. Area Master Plan is the current approved local plan for the physical development of a particular planning area, combination of planning areas, or parts of planning areas, as set forth in the Regional District Act. Clean Air Act Amendments of 1990 (CAAA) is an amendment to the Clean Air Act of 1977, which requires reductions in certain emissions generated by mobile (vehicle) and stationary (buildings, smoke stacks, etc.) means to levels which are below the National Ambient Air Quality Standard by specified dates. An employee is any person who is employed on a full-time basis, and who arrives or leaves the work site during either of the A.M. or P.M. peak periods. Guidelines are the "Guidelines for the Analysis of the Traffic Impact of Development Proposals," as adopted by the Planning Board. Nonattainment Area is a geographic location designated by the U.S. Environmental Protection Agency (EPA) in which emissions of certain chemical compounds exceed acceptable limits established by the EPA under the Clean Air Act Amendments of 1990. Peak periods are the time periods of 6:30 A.M. to 9:30 A.M. and 3:30 P.M. to 6:30 P.M. State Implementation Plan is a plan required by the CAAA to demonstrate what legally enforceable measures will be used to reduce emissions to a point within an acceptable range established by the U.S. EPA for the region. Transportation Demand Management (TDM) is a process or procedure intended to reduce vehicle trips during specified periods of the day. This includes, but is not limited to, such strategies as car and van pools, transit use incentives, parking fees and disincentives, improved pedestrian and bicycle access and facilities. A Transportation Demand Management Agreement (TDMA) is a written agreement between the Transportation Demand Management Technical Advisory Committee, as agent for the Prince George's County Planning Board, and a Transportation Management Association or other designated entity, which specifies the amount of vehicle trips to be reduced and the procedures by which these trips will be reduced. A Transportation Demand Management District (TDMD) is a legally defined geographic area in which vehicle trip reduction procedures, strategies, and programs are required. A Transportation Demand Management Plan (TDMP) is a document developed by a Transportation Management Association, or other entity required to reduce vehicle trips, which identifies programs and strategies which will be implemented by the property owner to satisfy the trip reduction requirements of the TDM District. Transportation Demand Management Technical Advisory Committee (TDMTAC) is a technical staff committee, established by the Planning Board, composed of transportation professionals who advise the County Council, the Planning Board, and interested parties concerning issues related to vehicle trip reduction. Transportation Management Association (TMA) is an entity established by property owners which is tasked with reducing vehicle trips within a TDMD through the use of programs, strategies, and other means.

The purpose of Transportation Demand Management (TDM) is to reduce vehicle trip generation of existing and proposed developments during peak periods and, indirectly, on a daily basis. Reduction of peak-period and daily vehicle trips will reduce hydrocarbon, nitrogen dioxide, and carbon dioxide emissions created by motor vehicle use. Reduction in vehicle-generated emissions is a requirement of the Clean Air Act Amendments of 1990. It is imposed on the Metropolitan Washington Region. Maryland is part of that region, and must adopt a State Implementation Plan which is developed by the Metropolitan Washington Council of Governments in coordination with the State Air Agency (Maryland Department of the Environment, Air Management Division) and the local governments within the Nonattainment Area. This State Implementation Plan must demonstrate how these emissions will be reduced to a point within the acceptable range. TDM programs must be a combined effort of both the public and private sectors, must be considered as early as possible during the land use planning stage of master plan development, must be funded by various sources, must be visible and identifiable with marketable strategies and advocates within both the public and private sectors, and must be evaluated on a periodic basis to determine the level of success.

The requirements of this Division shall apply to all property owners located within a TDMD who are employers, or whose property is used by employers, who employ employees who arrive or depart during peak periods, and who are either: Located within any business park, shopping center, or other commercial or industrial development of five or more acres, in separate or common ownership, which can be identified by one or more of the following characteristics: The development is known by a common name given to the project by its developer; It is governed by a common set of covenants, conditions, or restrictions; It was approved, or is to be approved, by the County; or It is the subject of a single preliminary or final plat of subdivision; or Located within any single or multitenant building or group of buildings, with a total of twenty-five (25) or more employees on a single subdivided lot, which is not included in subparagraph (1), above.