School of Civil Engineering

Safety Evaluation of right turn traffic control strategies at signalized intersections using hierarchical models with cross-level interactions

Right turn movements at signalized intersections are usually accommodated by a number of signal strategies. The safety level associated with a signal strategy is closely related to operational efficiency. For instance, when a protected right turn is provided instead of filtered right turn, it can reduce traffic conflicts but it may result in reduction of operational efficiency by increasing cycle time or reducing the green time available for through movement. Therefore, selection of an appropriate signal strategy for facilitating right turn movements is important in balancing between safety and operational efficiency at signalized intersections. Selection of a signal strategy primarily depends on site conditions including geometric characteristics and traffic operational factors. To select an appropriate signal strategy, a comprehensive understanding of the impact of signal strategies on intersection safety is needed, which is lacking in literature. This research will lead to a deeper and more fundamental understanding of intersection safety as a function of signal strategies as well as a new insight into signal strategy effectiveness over a range of operational and geometric conditions.

Considering hierarchical data structure of intersection crashes, this research will apply a two-level hierarchical modelling approach with cross-level interactions to increase the accuracy of model.

4.00pm - 5.00pm

Wednesday, 24 July 2019


AEB Seminar Room 502
Advanced Engineering Building (49)