The following are incomplete lists of notable expressways, tunnels, bridges, roads, avenues, streets, crescents, squares and bazaars in Hong Kong. Many roads on the Hong Kong Island conform to the contours of the hill landscape. Some of the roads on the north side of Hong Kong Island and southern Kowloon have a grid-like pattern. The roads are generally designed to British standards. Expressways generally conform to British motorway standards. Speed limits on all roads are , unless indicated otherwise by road signs. Usually, higher speed limits such as have been raised to facilitate traffic flow along main roads and trunk roads. On most expressways, speed limits have been raised to 80 km/h and due to the smooth geometry and for North Lantau Highway, while some expressways such as Island Eastern Corridor and Tuen Mun Road have been restricted to 70 km/h because of its long existence and/or geometrical constraints. Typically, the highest speed limit in all tunnels and suspension bridges is 80 km/h, while for other roads such as toll plaza areas and slip roads that do not lead to other expressways the speed limits are recommended to be reduced to the default 50 km/h speed limit. Routes Hong Kong's Transport Department is responsible for management of road traffic, regulation of public transport services and operation of major transport infrastructures, while Highways Department is responsible for planning, design, construction and maintenance of the public road system. In 2004, a new strategic route marking system was put in place, with most existing routes renumbered and exits to key places or to another route also numbered. (For example, a journey from Yau Ma Tei to the airport uses Route 3, taking Exit 5 to join Route 8. It is therefore identified as "3-5-8".) Routes 1 to 3 are cross-harbour north–south routes following the order in which the harbour tunnels were opened. Routes 4, 5, 7 and 8 run east–west, numbered from south to north. Route 9 circumscribes the New Territories. Route 10 runs from western New Territories from Route 9 and bends northward towards and passes the border to Shenzhen. However, the new system has caused some confusion to drivers used to relying on destination signs. The routes are designated as follows: Route 1: Aberdeen – Wong Chuk Hang – Aberdeen Tunnel – Causeway Bay – Cross-Harbour Tunnel – Kowloon Tong – Lion Rock Tunnel – Sha Tin (to join Route 9)