Ro/Ro Vessel Dwell Times

In 2020, only 8.3 million motor vehicles were imported to the United States, down about 1.4 million (14 percent) from 9.7 million in 2019. Remarkably, 2020 saw both a record low of 244,514 motor vehicles imported in May and a high of 954,951 motor vehicles imported in October.[1] Only 22 of the top U.S. ports have observed Roll-on/Roll-off (Ro/Ro) vessel calls.
As shown in the figure below, average Ro/Ro vessel dwell times at these top ports was estimated at 23.0 hours in 2020, up almost two hours from 21.0 hours in 2019. In 2020, there were 3,577 observed Ro/Ro vessel calls, down slightly from 3,815 in 2019. In the first half of 2021, average Ro/Ro vessel dwell time decreased to 23.8 hours. The ports had 1,799 observed vessel calls during the same period in 2021.[2] 
Average Ro/Ro vessel dwell times for individual ports are shown in the online Port Profiles.  
[1] U.S. Department of Transportation, Bureau of Transportation Statistics, analysis based upon trade data from the U.S. International Trade Commission, Data Web, available at as of May 2021.
[2] U.S. Department of Transportation, Bureau of Transportation Statistics, calculated using AIS data from the U.S. Coast Guard’s Nationwide Automatic Identification System (NAIS) archive, processed by U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, through the AIS Analysis Package (AISAP) software package, as of December 2021.