Effekter på hastighet och trafiksäkerhet med automatisk trafiksäkerhetskontroll : Gelin, Håkan et al trafiksäkerhetskameror etablerade under 2006
By: Gelin, Håkan.
Contributor(s): Aronsson, Anna | Lindholm, Magnus | Brüde, Ulf | Larsson, Jörgen. Statens väg- och transportforskningsinstitut (VTI) | Vadeby, Anna. Statens väg- och transportforskningsinstitut (VTI) | Varedian, Maria | Sundén, Joakim | Andersson, Jörgen | Towliat, Mohsen.Series: Vägverket. Publikation ; 2009:9.Publisher: Borlänge : Vägverket, 2009Description: 47 s.Subject(s): Speed limit | Video camera | Safety | Fatality | Injury | Average speed | Before and after study | Statistics | 845Online resources: Publikation/Publication | Projekt/Project Bibl.nr: VTI P1928:2009-9Location: Abstract: Syftet med denna rapport är att redovisa hittills föreliggande utvärdering av ATK avseende effekter på hastigheter (delprojektet har genomförts av Vectura) och effekter på trafiksäkerhet (delprojektet har genomförts av VTI). För att utvärdera hur hastigheten påverkats av ATK, har hastighetsmätningar med slangsensor genomförts vid omkring 80 av de av de totalt 350 kameror som nyetablerades på helt nya sträckor under 2006. Dessutom har ytterligare ett 100-tal platser mätts varav omkring 50 ligger mellan kamerorna. Mätningarna gjordes under en vecka innan etableringen och under ytterligare en vecka ett år senare. Utvärderingen visar, att den största hastighetsminskningen har skett vid kamerorna, men även mellan kamerorna minskar hastigheten, om än inte lika mycket. Trafiksäkerhetskamerorna har haft störst effekt där gällande hastighetsgräns är 70 km/h och något mindre effekt vid 90 km/h. Personbilsförares hastighetsbeteende har påverkats i större grad än lastbilsförares. Den sammanvägda medelhastigheten har minskat med uppskattningsvis 4,3 procent, sett över samtliga sträckor och alla gällande hastighetsgränser. Andelen förare som kör över gällande hastighetsgräns, har minskat med uppskattningsvis 34,5 procent. Man kan också se att de som kört fortast också är de som påverkats mest till att minska hastigheten. Vidare har den genomsnittliga hastigheten före etableringen stor betydelse för hur stor hastighetsminskningen blivit. Trafiksäkerhetskamerorna har haft bäst effekt där det tidigare gått mycket för fort.Abstract: The purpose of this report is to present road safety camera evaluations so far with regard to: - Effects on speed, evaluated by Vectura. - Effects on road safety, evaluated by VTI. In order to evaluate the effects that road safety cameras have on speed, tube sensors were used to measure speeds at the sites of approximately 80 of the 350 cameras installed on new stretches of road in 2006. Speed measurements were also taken at a further 100 locations, 50 of which were between cameras. Measurements were taken for a week prior to installation and again a year later. The evaluation shows that the greatest drop in speed occurs at sites where road safety cameras are installed. Lower rates of speed also occur between cameras, although to a lesser degree. Road safety cameras have most effect on stretches of roadway were the speed limit is 70 km/h and are slightly less effective on roads were the speed limit is 90 km/h. Road safety cameras have a greater impact on the behaviour of passenger car drivers than on the behaviour of truck drivers. There was an overall drop in the average speed on all stretches of road and for all speed limits of an estimated 4.3 percent. There was an estimated 34.5 percent reduction in the proportion of drivers that exceed the speed limit. It is also evident that drivers who drive fastest are most inclined to lower their speeds. Moreover, the average rate of speed prior to the installation of road safety cameras has a considerable effect on the extent to which speeds will be reduced once cameras are deployed. Road safety cameras have most effect on stretches of road on which vehicles previously travelled much too fast. In order to evaluate the effect that road safety cameras installed in 2006 have on traffic accidents, both on new stretches of roadway and on stretches where old cameras were replaced, the number of fatalities and people killed or seriously injured in 2007 was analysed using both 'before and after' and 'with and without' studies. The results suggest that speed cameras reduce the number of fatalities by 20 to 30 percent and the number of people killed or seriously injured by 20 percent. The outcome was not always statistically significant, which can be attributed to a shortage of statistical accident data. Based on calculations using the power model, it appears that the injury results correspond to a reduction of about 5 percent in the average rate of speed on all stretches of roadway on which road safety cameras are deployed. In view of the stretches of road with speed cameras that were installed by the end of 2006, around 1 770 kilometres of roadway in all, it is estimated that the annual number of lives saved (based on a 30 percent reduction) amounts to approximately 13, with an annual reduction in fatalities and people killed or seriously injured of about 48 (based on a reduction of 20 percent). By adjusting the number of road safety camera locations to approximately 2 400 kilometres of road by the end of 2007, the number of lives saved annually was approximately 18, with about 65 fewer people killed or seriously injured per year. With a further 250 to 300 kilometres of road safety cameras being deployed in 2008, there should be about 20 fewer fatalities and a saving of 70 killed or seriously injured persons per year. If one reckons on a 20 percent reduction in the number of fatalities, the specified number of lives saved annually (13, 18 and 20) would amount to about 8, 11 and 12 respectively. 4(47) The evaluation shows that the target "to reduce the average speed and speed violations in the road transport system and thus to help reduce the number of fatalities and people seriously injured " was achieved. It is of paramount importance to continue monitoring road safety cameras for a several years to come in order to obtain reliable results and also to ascertain whether the results remain stable over time.
Holdings: VTI P1928:2009-9