Modeling of Delay Induced By Downstream Traffic Disturbances at Signalized Intersections
Investigator:	Ghassan Abu-Lebdeh, Department of Civil and Environmental Engineering

This research presents macroscopic models to estimate delay at signalized intersections that is caused by downstream traffic disturbances such as queues in closely spaced settings. The models use basic traffic flow properties and control parameters at neighboring intersections. The models were applied to a hypothetical two-signal system. The results show that delay caused by downstream disturbances can be significant and therefore must be included in level of service and capacity analyses. The results show that control parameters such as offsets and green splits at upstream and downstream approaches play a key role in reducing delay. Validation using microscopic traffic simulation shows a close agreement between delay estimates from the proposed models and that from the microscopic simulation model.

• Ahmed, K. and Abu-Lebdeh, G. Modeling of Delay Induced By Downstream Traffic Disturbances At Signalized Intersections. Accepted for presentation in 84th Transportation Research Board Meeting, Washington D.C., January 05 (under review for publication)
• Ahmed, K. and Abu-Lebdeh, G. "Modeling of Signalized Intersection Delay Induced by Downstream Traffic Disturbances". Proceedings of the 21st Australian Research Board Conference, Cairns, Australia, May 2003