The sessions and exhibits for this meeting will occur January 21–22 and 25–29.

From the Transportation Research Board website:

The meeting program will cover all transportation modes, addressing topics of interest to policy makers, administrators, practitioners, researchers, and representatives of government, industry, and academic institutions. A number of sessions and workshops will focus on the spotlight theme for the 2021 meeting: Launching a New Century of Mobility and Quality of Life. This year’s meeting also will feature dozens of sessions on how COVID-19 has impacted transportation and how transportation professionals and researchers are responding.