 This solves the problem of a break between the lower town and the upper town and the two parts of the city are connected by long boulevards, winding roads, many stairs, a funicular, and finally the Jenner tunnel.The CODAH transport network is called "Lia" and is operated by the "Ocean Port Transport company" (CTPO), a subsidiary of Veolia Transport.The overhaul of the bus network in 2008 helped to ensure a better service for all the towns in the metropolitan area.