N11 highway

National Route 11 (N11) is an 18 km major primary route that forms part of the Philippine highway network. It is a component and the main route of Circumferential Road 5 (C-5), connecting the cities of Taguig, Pasig and Quezon.

History
When the routes were assigned by the Department of Public Works and Highways, the segment of Circumferential Road 5 (C-5) from Taguig to Quezon City, except for its at-grade section below the Bagong Ilog Flyover in Pasig, was assigned as N11. These roads under C-5 include the Carlos P. Garcia Avenue, Eulogio Rodriguez Jr. Avenue, Bonny Serrano Avenue, and Katipunan Avenue.

Route description
The route's northern terminus starts from a route change from N129 while making a junction on C.P. Garcia Avenue, a tertiary road in Barangay U.P. Campus, Quezon City. It traverses to the Quezon City, Pasig, and Taguig. In Quezon City, the highway then follows Katipunan Avenue's at-grade section parallel to the Katipunan/Aurora Flyover, classified as a tertiary road that carries traffic crossing N59. Later, it follows the Libis Tunnel, Libis Flyover, and the at-grade section of C-5 as it transitions from Katipunan Avenue to Eulogio Rodriguez Jr. Avenue via Bonny Serrano Avenue. In Pasig, the highway is then carried by the Bagong Ilog Flyover in Pasig as it parallels another C-5 route (N141) below the flyover. Upon leaving Taguig, the route meets the respective interchanges of C-5 Southlink Expressway and South Luzon Expressway (SLEX) before its southern terminus at the East Service Road, a frontage road of the Skyway At-Grade section of SLEX.