Increasing the Flow Capacity of Signalized Intersections with Pre-signals: Theory and Case Study

Opposing left-turning vehicles at signalized intersections block each others’ view of oncoming traffic. The ability to see oncoming traffic is critical for safe negotiation of left-turns at intersections during a permitted left-turn phase of the signal. Offsetting of opposing left-turn lanes at signalized intersections improves sight distance for left-turning motorists. This paper reports on a ...

BACKGROUND Human behaviour is an obvious, yet under-studied factor in pedestrian injury. Behavioural interventions that address rule violations by pedestrians and motorists could potentially reduce the frequency of pedestrian injury. In this study, a method was developed to examine road-rule non-compliance by pedestrians and motorists. The purpose of the study was to examine the potential assoc...

This paper analyzes pedestrian injury severity from automobile crashes at signalized intersections in a medium-size city. It estimates an ordered logit model of injury severity and finds that vehicle type, gender, land-use, speed limit, traffic volume, the presence of sidewalks and visual-obstruction significantly explain pedestrian injury severity in vehiclepedestrian crashes at signalized int...

The yellow signal driver behavior, reflecting the dilemma zone behavior, is analyzed using naturalistic data from digital enforcement cameras. The key variable in the analysis is the entrance time after the yellow onset, and its distribution. This distribution can assist in determining two critical outcomes: the safety outcome related to red-light-running angle accidents, and the efficiency out...

Real-time monitoring of traffic signal system operations can be accomplished through the central or closed loop software that communicates with the traffic signal controllers in the field. However, there are a few significant limitations with this approach. This paper presents an alternative approach to improve real-time monitoring of signalized intersections operations using instrumentation at...

Traditional safety countermeasures at work zones include setting up special signs, installing barriers and a lower speed limit in work zones. For stop sign areas, usually our countermeasure is to remove all the obstructions. For signalized intersections, we usually improve the safety by setting up the signal lights in an optimized layout. However, many accidents still happen despite of these tr...

Signal Coordination of consecutive intersections were carried out by thumb rule by coupling the indices depend on ratio of traffic volume to distance as well as modelled flow. As eminent resolution data is easily available from intersections, it becomes desire to analyses the actual stream of vehicle flow better to characterize is signal coordination desirable? As increase in vehicular populati...

Although much is known about the operation of signalized intersections, little or no empirical research has been conducted regarding bicycle capacity at these locations and the correspondent contributory factors. The purpose of this study is to accurately quantify the capacity of bikeway at signalized intersection through a fluid dispersion approach, and ultimately the lane group capacity. Usin...