Travelers could be in for a rough time in airports and on the roads Thursday.

Experts say Dec. 26 tends to be an extraordinarily heavy travel day, where traffic peaks between 4 and 6 p.m.

If you are heading out the day after Christmas, you might want to leave before or after those hours.

According to AAA, 115.6 million people will be traveling during the holiday period, which started Saturday Dec. 21 and will go through Jan. 1. That’s more than 4 million people than last year and the most since AAA started recording numbers 19 years ago.