Analysis of severity of right-turning vehicles conflicts at unsignalised T-intersections Available to Purchase

Right-turn vehicle manoeuvres are more prone to severe crashes at unsignalised T-intersections, with motorised two-wheelers (M2Ws) and auto-rickshaws (M3Ws) being the major culprits in India. The aim of the present study is to explore the effect of vulnerable motorists (driving M2Ws and M3Ws) on the probability of severe right-turn conflicts (PSRCs). Right-turn vehicle conflicts of minor road traffic are estimated using post-encroachment time (PET) at five unsignalised T-intersections in three cities in India. Also, in this study, a threshold value for PET for right-turn conflict severity is proposed, using support vector machines. The effect of vulnerable motorists on PSRCs is examined using a binary logit model. The presence of a higher proportion of M2Ws and M3Ws in right-turning vehicles and conflicting through-vehicles resulted in a high risk of severe conflicts, according to the findings. Furthermore, the results show that the speed of right-turning vehicles and conflicting through-vehicles, vehicle gaps, right-turning traffic and unusual driving paths all have a significant impact on the severity of right-turning vehicle conflicts. The proposed thresholds and model results can help traffic engineers and safety experts to assess the safety of unsignalised T-intersections and identify the critical unsignalised T-intersections.