The Corridor Cities Transitway (CCT) is a proposed 15-mile (24 km) bus rapid transit line in Maryland that would run from the Shady Grove Metro station in Gaithersburg northwest to Clarksburg.

"[5] On August 5, 2013, the State of Maryland announced that $100 million has been budgeted for planning, final design, and right-of-way acquisition for the first phase of the project, which comprises 9 miles (14 km) of the route.

[7] A study was performed by the Maryland Transit Administration (MTA) in coordination with the larger I-270/US 15 Multi-Modal Corridor Study conducted by the Maryland Department of Transportation, examining multiple options for the region including possible express toll lanes along I-270.

[3] Subsequently, the state removed the project from the development and evaluation phase of the Consolidated Transportation Plan.

"[4] In 2019 MDOT spokeswoman Erin Henson said the state would only be involved if the project connected “multiple jurisdictions in more than one county."