IRDES (Improving Roadside Design to Forgive Human Errors) is a research project of the cross-border funded research programme “ENR SRO1 – Safety at the Heart of Road Design”. Each year around 35,000 persons are fatally injured in Europe due to road accidents. The fatality rate in single vehicle run-of-road accident is around 45%. One of the key issues of this high ROR fatality rate is to be found in the design of the roadsides that are often “unforgiving”. The aim of this deliverable is to presents the results of Work Package 2, which include four studies on different approaches to analyse the effectiveness of identified treatments which are variation of shoulder width; removal of barrier terminals; implementation of grooved rumble strips and treatments in curves. The report focuses on the methodologies rather than on the result of the studies. To assess the effectiveness of shoulder width extension a tool designed to analyse vehicle speeds and trajectories was evaluated. The tool, named OT (Observatory of Trajectories), enables to measure vehicle movements. Due to delays in the modifications of the road, only measurement before the modifications could be conducted and analysed. Some issues regarding the amount of data collected were found and modifications to the method are needed. In the study assessing the safety effects of removing unprotected barriers terminals on secondary rural roads the development of a Crash Modification Factor was derived. The method is based on cross sectional analysis of part of the Arezzo Prince road network in Italy. The procedure proposed could be applied to the evaluation of different roadside features. To assess the effectiveness of the implementation of grooved rumble strips on dual carriageways comparisons between treated and non-treated roads were evaluated by statistical methods. Accident data including all severities in single vehicle accidents from several years with and without treatment was used in the analysis. The results showed that the estimated treatment effect is a 27.2% reduction of the accident intensity rate for single vehicle accidents. The assessment of the effectiveness of treatments in curves was evaluated by using Vehicle-Infrastructure-Interaction Simulations (VIIS) based on measured road infrastructure parameters. Case studies of two accident spots in curves were selected and simulated with different safety treatments and parameter values (sensitivity analyses).

Guide for the Assessment of Treatment Effectiveness / H. Fagerlind; J. Martinsson; P. Nitsche; P. Saleh; Y. Goyat; F. La Torre; A. Grossi. - ELETTRONICO. - (2011), pp. 1-130.

Guide for the Assessment of Treatment Effectiveness

LA TORRE, FRANCESCA;
2011

Abstract

IRDES (Improving Roadside Design to Forgive Human Errors) is a research project of the cross-border funded research programme “ENR SRO1 – Safety at the Heart of Road Design”. Each year around 35,000 persons are fatally injured in Europe due to road accidents. The fatality rate in single vehicle run-of-road accident is around 45%. One of the key issues of this high ROR fatality rate is to be found in the design of the roadsides that are often “unforgiving”. The aim of this deliverable is to presents the results of Work Package 2, which include four studies on different approaches to analyse the effectiveness of identified treatments which are variation of shoulder width; removal of barrier terminals; implementation of grooved rumble strips and treatments in curves. The report focuses on the methodologies rather than on the result of the studies. To assess the effectiveness of shoulder width extension a tool designed to analyse vehicle speeds and trajectories was evaluated. The tool, named OT (Observatory of Trajectories), enables to measure vehicle movements. Due to delays in the modifications of the road, only measurement before the modifications could be conducted and analysed. Some issues regarding the amount of data collected were found and modifications to the method are needed. In the study assessing the safety effects of removing unprotected barriers terminals on secondary rural roads the development of a Crash Modification Factor was derived. The method is based on cross sectional analysis of part of the Arezzo Prince road network in Italy. The procedure proposed could be applied to the evaluation of different roadside features. To assess the effectiveness of the implementation of grooved rumble strips on dual carriageways comparisons between treated and non-treated roads were evaluated by statistical methods. Accident data including all severities in single vehicle accidents from several years with and without treatment was used in the analysis. The results showed that the estimated treatment effect is a 27.2% reduction of the accident intensity rate for single vehicle accidents. The assessment of the effectiveness of treatments in curves was evaluated by using Vehicle-Infrastructure-Interaction Simulations (VIIS) based on measured road infrastructure parameters. Case studies of two accident spots in curves were selected and simulated with different safety treatments and parameter values (sensitivity analyses).
2011
1
130
H. Fagerlind; J. Martinsson; P. Nitsche; P. Saleh; Y. Goyat; F. La Torre; A. Grossi
File in questo prodotto:
File Dimensione Formato  
IRDES_WP2_DeliverableD2_v2_111222.pdf

accesso aperto

Tipologia: Versione finale referata (Postprint, Accepted manuscript)
Licenza: Open Access
Dimensione 2.92 MB
Formato Adobe PDF
2.92 MB Adobe PDF

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/627987
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact