The Connecticut Department of Transportation (officially referred to as CTDOT, occasionally ConnDOT, and CDOT in rare instances) is responsible for the development and operation of highways, railroads, mass transit systems, ports and waterways in Connecticut.
CTDOT manages and maintains the state highway system. It oversees the Shore Line East and Hartford Line commuter rail systems under the CTrail brand, and owns the Connecticut section of the New Haven Line used by Metro-North Railroad and Amtrak Northeast Corridor services. CTDOT also oversees the CTtransit bus system, as well as the CTfastrak bus rapid transit service.