Maryland transit officials are seeking residents, business owners and local workers interested in helping to plan stations for a proposed Corridor Cities Transitway in the Interstate 270 corridor of upper Montgomery County.

Four advisory committees will advise the Maryland Transit Administration on design decisions, including station design and amenities, traffic management and bus operations.

The Corridor Cities Transitway is a proposed 15-mile bus rapid transit system that would run between the Shady Grove Metro Station and the COMSAT facility just south of Clarksburg. The first nine-mile phase, which is undergoing environmental study and engineering work, would run between Shady Grove and the Metropolitan Grove MARC commuter rail station. The second six-mile phase between Metropolitan Grove and the COMCAST facility is designated as a “future extension.”

If construction funding is secured, the state plans to break ground on the first segment in 2018 and open it in 2020, state officials have said. The southern section is estimated to cost $545 million in 2012 dollars. The northern part is projected to cost $300 million.

People can nominate themselves for the advisory committees via online forms at Forms are due Dec. 3.