Safety is emerging as an area of increased interest and awareness within transportation engineering. This study proposes a methodology to estimate rear-end crash potential for roundabout turning movements using safety performance indicators or surrogate safety measures. A safety performance study is carried out using measures obtained experimentally from a video-taping of traffic operations at an urban roundabout situated in Cosenza, Italy. Safety performance is expressed from the perspective of “rear-end” vehicle interactions using five of the most common safety measures: Maximum Deceleration Rate to Avoid a Crash, Time to Collision, Proportion of Stopping Distance, Time Integrated Time-to-Collision, and Crash Potential Index. Differences in safety performance are discussed with respect to the different manoeuvres, and type of measure. The results of this analysis show that high risk vehicular movements and high risk roundabout areas are concentrated in geometric elements characterized by high vehicular interactions. This study underscores the usefulness of safety performance measures for providing a proactive approach to road safety studies since this indicators are able to detect safety problems before they result in crash events.
Investigating rear-end potential conflicts for roundabout turning movements
GUIDO, Giuseppe;Vitale A.;
2013-01-01
Abstract
Safety is emerging as an area of increased interest and awareness within transportation engineering. This study proposes a methodology to estimate rear-end crash potential for roundabout turning movements using safety performance indicators or surrogate safety measures. A safety performance study is carried out using measures obtained experimentally from a video-taping of traffic operations at an urban roundabout situated in Cosenza, Italy. Safety performance is expressed from the perspective of “rear-end” vehicle interactions using five of the most common safety measures: Maximum Deceleration Rate to Avoid a Crash, Time to Collision, Proportion of Stopping Distance, Time Integrated Time-to-Collision, and Crash Potential Index. Differences in safety performance are discussed with respect to the different manoeuvres, and type of measure. The results of this analysis show that high risk vehicular movements and high risk roundabout areas are concentrated in geometric elements characterized by high vehicular interactions. This study underscores the usefulness of safety performance measures for providing a proactive approach to road safety studies since this indicators are able to detect safety problems before they result in crash events.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
