Procedures about highway capacity are ever changing. Therefore, TRB hosted a webinar on Thursday, March 25, 2021 from 2:00-3:30 PM Eastern that described new methods developed for the Highway Capacity Manual (HCM) that evaluate spillback for freeways and urban streets. Presenters introduced the proposed new HCM chapter and provided case studies to illustrate the new methods.

This webinar was organized by the TRB Standing Committee on Highway Capacity and Quality of Service. It also refers to NCHRP Web-Only Document 290: Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets.

The slides and recording are available. 

Webinar agenda and presenters

1. Overview of methods: Lily Elefteriadou, University of Florida
2. Spillback into freeways and signalized and unsignalized intersections: Fabio Sasahara, University of Florida
3. Case studies: Behzad Aghdashi, University of Florida
4. Question and answer session: Moderated by Tom Creasey, Caliper Corporation

The first 60 minutes of the webinar will be for presentations and the final 30 minutes will be reserved for audience questions.

Learning Objectives

At the end of this webinar, participants will be able to:

1. Quantify the impacts of spillback and travel time
2. Utilize the HCM tools for evaluating congestion at the system level

Professional Development Hours

Professional Development Hours (PDHs) earned on completion of this program were reported to the Registered Continuing Education Program (RCEP). Certificates of Completion are issued to all participants via the RCEP.net online system. Complaints about registered providers may be addressed to RCEP, 1015 15th Street, NW, 8th Fl., Washington, DC, 20005.