July 11, 2024


12:00 PM - 1:00 PM EST

Contact Hours



University of Virginia
Virginia Transportation Research Council – VTRC Auditorium
530 Edgemont Road
Charlottesville, VA 22904


Visitors may park in the upper visitors lot in front of the building and if it gets filled, in the lower lot behind the building. There is a sign at the entrance to the lower lot directing visitors to the upper lot. Entry from the back lot can be buzzed in from the front desk and visitors may take the elevator to the third floor to get to the auditorium. When the elevator opens the auditorium is right there on the left.


The Virginia LTAP, in partnership with the Virginia Transportation Research Council (VTRC), the research leg of VDOT, invite you to join us for a one-hour lunch and learn event. This new series will showcase VTRC’s transportation innovation and research.

These monthly, one-hour events will take place at various locations across the Commonwealth from 12:00 pm to 1:00 pm. You may join remotely via Zoom or attend in-person. Lunch will be provided for those who attend in-person. Those attending in-person will also receive some swag.

TOPIC: Congestion Analysis: Identifying Arterial Bottlenecks and Determining the Cost of Congestion Due to Incidents

Congestion bottleneck analysis using volume and probe speed data are widely used in project planning and performance evaluation. The first part of this presentation will discuss the use of three tools for bottleneck analysis on arterials: RITIS Bottleneck Ranking tool, FHWA CBI tool, and a tool developed by Virginia Transportation Research Council (VTRC). The RITIS and CBI tools are designed to identify congested road segments in one travel direction, while the VTRC tool is customized to rank intersection bottlenecks as it considers the traffic on all intersection approaches at the same time. The pros and cons of each tool will be discussed.

Traffic incidents are one of the major causes of congestion. VDOT regularly considers how an effective incident management strategy can benefit the public. The big question is: how much money could commuters save if an incident response plan reduced the time roads were closed by just one minute? The second part of this presentation will discuss a study that uses economic, traffic, incident, and roadway geometry datasets to estimate the per-minute incident congestion costs for freeways in Virginia. The study reveals significant cost variations across VDOT districts, routes, time-of-day, and day-of-week; the costs can range from less than $1 per minute for shoulder-closing events in rural areas to more than $1,000 per minute for lane-blocking incidents in Northern Virginia during AM peak hours. With the variation in costs, this study recommends that corridor-based cost values be used for analyses of project across different locations and time periods. A visualization tool was developed to provide easy access to the congestion cost values for VDOT staff.



Mo Zhao

Mo Zhao is a senior research scientist at the Virginia Transportation Research Council. Her current research focuses on big data analytics in transportation, system performance measurement, intelligent transportation systems, and highway safety. She has a Ph.D. degree in Civil Engineering and is a registered Professional Engineer in Virginia.

Chien-Lun Lan

Chien-Lun Lan is a research scientist at the Virginia Transportation Research Council. Holding a Ph.D. in Civil and Environmental Engineering, he has consistently contributed to traffic operations and safety. His research interests span both traditional and emerging topics in transportation – from estimating freeway congestion costs and identifying high-crash road segments to leveraging data analytics to monitor roadway performances.

Who Should Attend

State, Local, and private industry transportation engineers

Registration and Payment

The following registration fees cover the session, all course materials and meals:


Click here for UVA TTA's general registration information, cancellation policy, and refund policy. UVA TTA accepts the following credit cards: American Express, VISA, MasterCard, and Discover. Credit card information cannot be taken over the phone. Alternatively, after registering you can print out a voucher to send in with your payment. After you have completed the transaction you will receive an automatically generated email confirming registration and payment if applicable. Final confirmation and instructions will be sent out during the week prior to the class date.