The , signed as
Route C1, is one of the routes of the
Shuto Expressway system serving the central part of the
Greater Tokyo Area. The route is a complete loop around the central Tokyo
wards of
Chiyoda,
Chuo, and
Minato, with a total length of . In addition to serving areas of central Tokyo, the Inner Circular Route is also serves the origin of the Shuto Expressway radial routes.