Day after Christmas expected to be a travel nightmare, experts say

AAA says that automobile travel on Thursday could take twice as long as normal.

Thursday will also be the worst time to be on the road according to the American Automobile Association. AAA projects that trips will take twice as long as normal in major U.S. cities.

An estimated 104 million holiday travelers are expected to drive to and from their holiday destinations from Saturday, Dec. 21 through Wednesday, Jan 1. That's the highest number on record.

According to INRIX , here are the worst days to travel this holiday season and the peak congestion period in major U.S. cities:

- Atlanta, worst travel day: Dec. 26, peak congestion period: 4:30 - 6:30 p.m.

- Boston, worst travel day: Dec. 27, peak congestion period: 4:00 - 6:00 p.m.

- Chicago, worst travel day: Dec. 26, peak congestion period 4:45 - 6:45 p.m.

- Detroit, worst travel day: Dec. 26, peak congestion period: 4:30 - 6:30 p.m.

- Houston, worst travel day: Dec. 27, peak congestion period: 4:30 - 6:30 p.m.

- Los Angeles, worst travel day: Dec. 26, peak congestion period: 4:25 - 6:25 p.m.

- New York, worst travel day: Dec. 26, peak congestion period: 4:15 - 6:15 p.m.

- San Francisco, worst travel day: Dec. 26, peak congestion period: 4:00 - 6:00 p.m.

- Seattle, worst travel day: Dec. 27, peak congestion period: 4:15 - 6:15 p.m.

- Washington, D.C., worst travel day: Dec. 26, peak congestion period: 4:00 - 6:00 p.m.