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Säker framkomlighet: trafiksäkerhetseffekter 2013 och 2014
Swedish National Road and Transport Research Institute, Traffic and road users, Traffic safety, society and road-user.
2016 (Swedish)Report (Other academic)Alternative title
Safe accessibility : traffic safety evaluation 2013 and 2014 (English)
Abstract [sv]

Detta notat presenterar en studie om trafiksäkerhetseffekter av fyra olika åtgärder som implementerats inom Trafikverkets projekt ”Säker framkomlighet”. Resultaten visar att samtliga åtgärder har minskat antalet dödade och svårt skadade.

De fyra åtgärderna och resultaten för dessa var:

  1. Tvåfältiga landsvägar med fräst mitträffla. Antalet dödade och svårt skadade i singelolyckor på länk (vägsträckor mellan korsningar) har minskat med 24 procent. Totalt sett över alla olyckstyper har antalet dödade och svårt skadade minskat med 15 procent.
  2. Mötesfria vägar med mitträcke (gles 2+1 med räcke). Antalet dödade och svårt skadade på länk har minskat med 71 procent och antalet personskadeolyckor med 36 procent. Det statistiska underlaget är än så länge för litet för att det ska gå att dra alltför långtgående slutsatser, fortsatt uppföljning rekommenderas för att få säkrare resultat.
  3. Riktningsseparerade vägar (gles 2+1 med målad/räfflad mitt). Det statistiska underlaget är för litet för att det ska gå att dra säkra slutsatser, men tendensen är att antalet dödade och svårt skadade har minskat med 44 procent
  4. Räffling av yttre vägren på landsbygdsmotorvägar. Totalt sett har antalet dödade och svårt skadade minskat med cirka 16 procent och för singelolyckor med cirka 25 procent.

Metoden som använts är en före-efterstudie med kontrollgrupp. I en separat analys har eventuella regressionseffekter beaktats för samtliga åtgärder.

Abstract [en]

This report studies the traffic safety effects of four different measures implemented on rural roads in Sweden. The measures investigated are:

  1. milled centerline rumble strips on rural 2-lane roads
  2. narrow 2+1 roads with median barrier
  3. divided roads (painted 2+1 roads with median rumble strips)
  4. shoulder rumble strips on motorways

The method used is a before and after study with control group based on crash statistics from the Swedish crash data base Strada. Using a control group, the results have been adjusted for the general road safety trend and changes of traffic volumes. In addition, a limited Empirical Bayes study was done to adjust for regression to the mean.

For milled centerline rumble strips on rural 2-lane roads, results show that when regression to mean is considered, the number of fatalities and seriously injured in single-vehicle crashes on road links are reduced by 24 percent (significant), but the number of injury crashes has not changed significantly.

For narrow 2+1 roads (9 m wide), the total number of fatalities and seriously injured decreased by 62 percent and the total number of personal injury crashes decreased by 29 percent. Correcting for regression to the mean gave very similar results. It should be noted that the after period is still short and a continued follow-up is recommended.

In the case of divided roads (painted 2+1 roads with median rumble strips), results show that when regression to mean is considered, the number of fatalities and seriously injured on road links are reduced by 44 percent. If regression to mean is not considered, the effects are smaller (-29%) and not statistically significant.

For shoulder rumble strips on motorways, the results show that the total number of killed and seriously injured decreased by 16 percent and the number of fatalities and seriously injured in single-vehicle crashes decreased by 25 percent.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2016. , 53 p.
Series
VTI notat, 7-2016
Keyword [en]
Rumble strip, Safety fence, Central reserve, Traffic lane, Width, Impact study, Accident rate, Fatality, Injury, Severity (accid, injury), Before and after study
National Category
Infrastructure Engineering
Research subject
80 Road: Traffic safety and accidents, 82 Road: Geometric design and traffic safety
Identifiers
URN: urn:nbn:se:vti:diva-10174OAI: oai:DiVA.org:vti-10174DiVA: diva2:916011
Available from: 2016-03-31 Created: 2016-03-31 Last updated: 2016-08-23Bibliographically approved

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