2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Ata Khan
Inherent resilience of a link or a corridor is the ability to serve traffic on a sustained basis under surges of traffic. The study of the inherent resilience of traffic networks has not received due research attention. The ability of a link or a corridor can be enhanced with design factors. Traffic control means such as adaptive systems can be applied as well and these have been studied in the past and are in use in many cities around the world. However, there has been a general lack of attention to improving inherent resilience with geometric design factors.
The paper will consist of five parts. The first part serves as background, including highlights of literature. The second part defines a model of traffic service capability and its inputs are noted. Here, the intent is to investigate link and corridor-level means to enhance the inherent resilience in terms of sustained service flow. Specifically, the developed predictive model incorporates geometric factors, volume-delay functions, and operating speed. This model can be used to study service volume changes in relation to selected variables, namely segment length, green time duration, number of lanes, and posted speed limit. The third part defines a micro-simulation methodology, which enables testing of factors for enhancing inherent resilience (i.e. the ability to resist the loss of traffic serving capabilities). These factors include segment geometric and control systems. The simulation-based methodology will be described in detail and process followed to prepare input will be explained. The link volume-delay functions that were simulated incorporate selected geometric and control factors. In addition, the well-known U.S. Bureau of Public Roads (BPR) equation was used in simulation studies. The fourth part of the paper will cover an analysis of simulation outputs. Finally, conclusions are presented.
The findings of this research on the resilience of traffic networks are intended for use by traffic engineers so that traffic networks can be designed and operated with the improved ability of links and corridors to withstand traffic shocks better as compared to the conventional approaches.