The Southern Illinois Metropolitan Planning Organization (SIMPO) was created to perform and carry out a continuing, cooperative and comprehensive transportation planning process for the Carbondale Urbanized Area in accordance with applicable federal laws, policies and procedures, and with the cooperation and assistance of its members and the U.S. Department of Transportation.

The work of SIMPO will be guided by the Policy Committee, which shall have final authority over all matters within the jurisdiction of SIMPO. A Technical Committee provides technical advice and recommendations to the Policy Committee and conducting or overseeing the technical planning functions and duties of SIMPO.  For administrative purposes, Greater Egypt Regional Planning and Development Commission shall serve as the local Lead Agency.