4.2 Article

Models for quick evaluation of displaced right turn intersection performance

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TAYLOR & FRANCIS LTD
DOI: 10.1080/03081060.2023.2265910

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Displaced right-turn; traffic simulation; regression model; practical reserve capacity; delay; junction modelling

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This study examines the performance of a displaced right-turn intersection design under different traffic flows and design conditions, and develops regression models for preliminary estimation of performance indicators, providing references for future junction remodelling works.
Alternative intersection designs can provide cost-effective solutions to overcome the proven inadequacy of conventional approaches. Several studies have assessed the performance of alternative designs against a range of traffic volumes and geometric design aspects, each in isolation, but a model which can factor in multiple variables into the analysis is the identified research gap. The displaced left-turn - DLT intersection design was found to be the most versatile, efficient, and transferable to locations elsewhere in the world. In this paper, a displaced right-turn intersection - a variant of DLT, was modelled for a range of traffic flows and design conditions. Regression models were developed for Practical Reserve Capacity and Delay as dependent variables with traffic flow, proportion of right-turning traffic, signal cycle time and length of displaced turn as explanatory variables. These models can provide relatively quick preliminary estimates of the performance indicators before committing to resource-consuming junction remodelling works.

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