A key issue for both sustainable transport and public health is the viability of cycling as a genuine alternative tothe car, particularly for short trips. This paper considers this issue by assessing hypothetically the travel timeimplications of substituting actual car trips with cycling. The car trips are captured over several weeks for 178Sydney motorists using GPS technology, while the cycling trips are generated using reverse geocoding processesin GIS software, taking into account the impacts of terrain in particular on cycling travel times. Both individualtrips and more importantly trip chains are considered. Assuming an 'inexperienced adult' cyclist, results suggestthat over 90 percent of car trips up to five kilometres in length (which comprise 58 percent of trips), could becycled within 10 minutes of the time taken by car, a similar finding to results reported elsewhere. As the level ofcycling experience increases, the 'bikeable' distance increases with the majority of 'commuter adults' being ableto cycle the median commuting distance in Sydney of 11 kilometres with little additional travel time compared toa car. When considering trip chains, while the competitiveness of cycling goes down as more legs are included,the total distance of the chain emerges as a more crucial issue with cycling being equally competitive for tripchains shorter than 10 kilometres as for individual trips shorter than 10 kilometres. Finally, when considered inthe context of daily travel time budgets, the analysis suggests around 20 percent of people could switch totallyfrom cars to bicycles without incurring more than a 20 minute additional increase in travel time on average perday.
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