Beijing is connected by road links to all parts of China as part of the National Trunk Road Network. Many expressways of China serve Beijing, as do 15 China National Highways. Beijing's urban transport is dependent upon the  "ring roads" that concentrically surround the city, with the Forbidden City area marked as the geographical center for the ring roads. The ring roads appear more rectangular than ring-shaped. There is no official "1st Ring Road". The 2nd Ring Road is located in the inner city. Ring roads tend to resemble expressways progressively as they extend outwards, with the 5th and 6th Ring Roads being full-standard national expressways, linked to other roads only by interchanges. Expressways to other regions of China are generally accessible from the 3rd Ring Road outward. A final outer orbital, the Capital Area Loop Expressway (G95), was fully opened in 2018 and will extend into neighboring Tianjin and Hebei.