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Sixteenth Street and Interstate 295 saw abandoned buses and private cars dotting their hilly stretches well into Thursday morning. Even relatively flat, incline-free major roads such as the Southeast-Southwest Freeway and Interstate 395 in Virginia had traffic moving at walking speeds or not at all Wednesday evening.

President Obama, arriving Wednesday evening at Andrews Air Force Base from a Wisconsin trip, couldn’t use the helicopter that would normally take him to the White House, forcing an hour-long motorcade journey.

The region’s major airports had to cancel hundreds of flights or close altogether Wednesday evening, but were able to got back up to normal operations by Thursday afternoon.

This article is based in part on wire service reports.