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The Transportation Element of the Mercer Island Comprehensive Plan meets the following regulations and requirements:

Growth Management Act — The Growth Management Act, enacted by the Washington State Legislature in 1990 and amended in 1991, requires urbanized counties and cities in Washington to plan for orderly growth for 20 years into the future. Mercer Island’s Transportation Element conforms to all of the components of a comprehensive transportation element as defined by GMA.

Commute Trip Reduction — In 1991, the Washington State Legislature enacted the Commute Trip Reduction Law which requires implementation of transportation demand management (TDM) programs to reduce work trips. In response to these requirements, Mercer Island has developed its own CTR program to reduce work trips by City employees. There are two other CTR-affected employers on the Island; both have developed CTR programs.

Air Quality Conformity — Amendments to the federal Clean Air Act made in 1990 require Washington and other states to develop a State Implementation Plan (SIP) which will reduce ozone and carbon monoxide air pollutants so that national standards may be attained. The Central Puget Sound area, including King County and Mercer Island, currently meets the federal standards for ozone and carbon monoxide. The area is designated as a carbon monoxide maintenance area, meaning the area has met federal standards, but is required to develop a maintenance plan to reduce mobile sources of pollution.