A follow up evaluation of the 50km/h default urban speed limit in South Australia

In 2003 the default urban speed limit (DUSL) in South Australia was lowered from 60 km/h to 50 km/h. An initial evaluation one year after the change showed that vehicle speeds and crashes had reduced on local roads with the 50 km/h limit and also on arterial roads that were signposted at 60 km/h. This paper reports the results of a follow up evaluation three years after the DUSL was introduced. Vehicles speeds were measured at the same 52 randomly chosen sites across the State. On-road speeds just before the default limit was introduced were compared with speeds measured one and three years later. Crash data was analysed by examining the crash history of all roads with a 50 km/h or 60 km/h speed limit, three years before and after the new DUSL was introduced. The study found that, on average, mean speeds had fallen by approximately 3.8 km/h on streets where the speed limit was reduced and by 2.1 km/h on arterial roads where 60 km/h speed limit signs were erected. There was a 23 per cent reduction in casualty crashes on 50 km/h roads and a corresponding 16 per cent reduction on 60 km/h arterial roads.


  • English

Media Info

  • Pagination: 12p

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Filing Info

  • Accession Number: 01387448
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 22 2012 10:26PM