The road safety has become a priority field worldwide and one of the major factors describing the transport system’s state with its positive and negative changes. Many studies on driver speed behaviour are found in the scientific literature, and researchers have addressed roadway alignment consistency for travel safety in context with real operating speeds. This paper illustrates an experimental analysis conducted on the State Highway “Tirrenia Inferiore” in Southern Italy without spiral transition curves between geometric tangent and circular elements on the horizontal alignment, to check a new prediction consistency model. Two consistency measures were developed and compared with the results available in scientific literature: the first was the relative area bounded by the speed profile and the average weighted speed; the second was the standard deviation of operating speeds in each design element along the entire road investigated. Combining these two previous measures and following an extensive sensitivity analysis, a consistency model was developed and thresholds for good, acceptable and poor road consistency can be proposed. The consistency prediction model was related to numbers of crashes occurred from 2003 to 2010. It was found that as design consistency increased, number of crashes decrease significantly. Consistency model can be use for this purpose during the geometric design process or during the evaluation process for two-lane rural highways.

Safety Data Analysis: Case Study of State Highway "Tirrena Inferiore" / Dell'Acqua, Gianluca; Busiello, Mariarosaria; Russo, Francesca; Lamberti, Renato; Giovanni, Coraggio. - ELETTRONICO. - (2013), pp. 1-14. (Intervento presentato al convegno TRB 92nd Annual Meeting 2013 tenutosi a Washington D.C. nel 13-17 gennaio 2013).

Safety Data Analysis: Case Study of State Highway "Tirrena Inferiore"

DELL'ACQUA, GIANLUCA;BUSIELLO, MARIAROSARIA;RUSSO, FRANCESCA;LAMBERTI, RENATO;
2013

Abstract

The road safety has become a priority field worldwide and one of the major factors describing the transport system’s state with its positive and negative changes. Many studies on driver speed behaviour are found in the scientific literature, and researchers have addressed roadway alignment consistency for travel safety in context with real operating speeds. This paper illustrates an experimental analysis conducted on the State Highway “Tirrenia Inferiore” in Southern Italy without spiral transition curves between geometric tangent and circular elements on the horizontal alignment, to check a new prediction consistency model. Two consistency measures were developed and compared with the results available in scientific literature: the first was the relative area bounded by the speed profile and the average weighted speed; the second was the standard deviation of operating speeds in each design element along the entire road investigated. Combining these two previous measures and following an extensive sensitivity analysis, a consistency model was developed and thresholds for good, acceptable and poor road consistency can be proposed. The consistency prediction model was related to numbers of crashes occurred from 2003 to 2010. It was found that as design consistency increased, number of crashes decrease significantly. Consistency model can be use for this purpose during the geometric design process or during the evaluation process for two-lane rural highways.
2013
Safety Data Analysis: Case Study of State Highway "Tirrena Inferiore" / Dell'Acqua, Gianluca; Busiello, Mariarosaria; Russo, Francesca; Lamberti, Renato; Giovanni, Coraggio. - ELETTRONICO. - (2013), pp. 1-14. (Intervento presentato al convegno TRB 92nd Annual Meeting 2013 tenutosi a Washington D.C. nel 13-17 gennaio 2013).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/540089
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