Transport The area was originally served by horse-drawn buses and trolleys but it was electric trams and trolley buses that led to the development of Burnside as a suburban residential area. Burnside is located at a transport crossroads for national freight movements. Freight traffic from Victoria diverges down Glen Osmond and Portrush Roads upon entering the metropolitan area via the South Eastern Freeway (formerly Mount Barker Road). Both roads carry an almost equal amount of freight traffic, Glen Osmond leads to Adelaide Airport and Outer Harbor while Portrush Road connects to the northern industrial suburbs, the state's north, Western Australia and the Northern Territory. In addition, they act as major commuter arteries for the Adelaide Hills and form the eastern part of Adelaide's outer bypass route. The current South Eastern Freeway was completed in 1999 and Portrush Road saw an extensive upgrade throughout 2003–2004. Other major commuter roads include Kensington, Magill and Greenhill Roads, which run east–west. Glynburn and Fullarton Roads provide secondary north–south corridors, the former runs close to the foothills and alleviates congestion on Portrush while the latter forms part of Adelaide's inner bypass route. Maintenance of the extensive road network is a State Government responsibility; the Federal Government provides funding for nationally important AusLink routes. Council provides recommendations to projects and participates in the upkeep of the curbs, frontage, footpaths and minor signage. Burnside residents rely overwhelmingly on cars as a means to travel to work; 64.3% drive their own vehicle and 5.6% are a regular passenger in one. 5.8% use public transport, in the form of Adelaide Metro buses, for their commute; 1.2% bicycle and 2.3% walk. Non-vehicular travel is on the rise, with usage higher than the Adelaide average and an increase in persons doing so between 1996 and 2001. 38% of Burnside households own one vehicle, 26.8% own two and 12.3% own three vehicles or more. Burnside and suburbs east of the city were served by an excellent tramway system that was shut down in the 1950s. With the advent of widespread automobile travel in the mid-20th century there was a tendency for motorists to use local roads in suburbs adjacent to the CBD for their commute home. 'Rat trails' of cars sneaked through narrow side-streets, presenting traffic bottlenecks. This was a particular problem for some western Burnside suburbs because of their location. Various traffic control methods were put in place (closing streets, speed