of the Department of Main Roads and the Roads and Traffic Authority) superseded the 1924 main road classifications and established the basis of the existing New South Wales (NSW) main road system. (the full list of main roads gazetted appears in the NSW Government Gazette of 17 August 1928). The number of a road for administrative purposes is not the same as the route number it carries e.g. the Great Western Highway is Highway 5 for administrative purposes but is signposted as part of route A32.) Many major routes in New South Wales, including Sydney motorways and even some routes named as "highways" are not officially gazetted as highways. For a list of all numbered routes in New South Wales, see List of road routes in New South Wales. While highways in many other countries are typically identified by number, highways in Australia, including New South Wales, are known mostly by names. These names typically come from 19th-century explorers, important politicians or geographic regions. Major motorways and highways serving Greater Sydney include: Eastern Distributor Southern Cross Drive General Holmes Drive M5 East Motorway M5 South Western Motorway Westlink M7 M2 Hills Motorway Lane Cove Tunnel Gore Hill Freeway Warringah Freeway Sydney Harbour Tunnel (or Sydney Harbour Bridge and Cahill Expressway Cycling Cycling in Sydney, New South Wales, Australia takes place for recreation, commuting and as a sport. Sydney has a hilly topography and so may require a slightly higher level of fitness from cyclists than flatter cities such as Melbourne and Canberra. Sydney depends heavily on motor vehicles where traffic and public transport operate at capacity. This means that cyclist are often competing with motorists for limited space on busier roads, and for limited government resources for expenditure on road infrastructure. In its favour, Sydney has a generally mild climate and there are active cycling groups. For the most part, cyclists ride on the road with motor vehicles (current regulations only permit cyclists under 16 years old to ride on the footpath. Historically, bicycle infrastructure was largely constructed in areas for recreational riding or along shared paths such as in parks. Prior to the involvement of Jan Gehl, the City of Sydney created a Bicycle Action Plan in 2007, part of which involved building physically separated cycleways. In May 2009, the first of these, a 200m stretch along King Street in the CBD opened. Taxis Sydney and the surrounding areas