In 1973, WMSRDC organized the Muskegon Area Transportation Planning Program as the Metropolitan Transportation Planning Organization (MPO) Policy Committee. In 2003, when the U.S. Census Bureau expanded the Muskegon Urbanized Area to include northern Ottawa County, WMSRDC, working with the Michigan Department of Transportation, realigned the Metropolitan Area Boundary (MAB) of the MPO and organized the West Michigan Metropolitan Transportation Planning Program (WestPlan). WMSRDC has staffed the MPO since 1973.

The WestPlan MPO undertakes a comprehensive transportation planning program to maintain the eligibility of local governments in the area to receive federal and state transportation funds for street and road improvements, as well as subsidies for mass transit.

The WestPlan MPO consists of a Policy Committee and a Technical Committee. The Technical Committee reports directly to the Policy Committee. The Policy Committee is responsible for all final decisions regarding transportation. All meetings, with the exception of special meetings, are held during normal business hours.

In addition to WestPlan MPO, WMSRDC also performs regional transportation planning which is similar to the WestPlan MPO program, but on a less intensive scale and is extended to include the entire region.

WestPlan addresses a multitude of transportation projects such as safety projects like widening lanes, bridge repairs and improvements, air quality projects like traffic signal synchronization, and enhancement projects like bike paths. Two important planning documents that are produced through this process are the Long Range Transportation Plan and the Transportation Improvement Program.

WestPlan also assists in transit planning for the Muskegon Area Transit System and Harbor Transit in Northern Ottawa County. Planning activities include the compilation of rider and route statistics and collaborating on services related to seniors and individuals with disabilities.