This holiday season, transportation data insights provider INRIX expects drivers will experience the worst traffic delays the weekends before Christmas Day and New Year’s Day.

The holidays themselves are expected to have minimal congestion.

Drivers in Boston, New York City, Seattle and Washington, DC could see double the typical delays.

Nationwide, travel times could be up to 30% longer.

“With a near record number of auto travelers expected this holiday season, drivers should expect delays in and around major metro areas, with Sunday, December 22 expected to be the nation’s worst day to travel,” says Bob Pishue, transportation analyst at INRIX. “Our advice is to avoid traveling during peak commuting hours during the week. If schedules allow, leave bright and early or after the evening commute.”

The times listed below are for the time zone in which the metro is located. For example, Atlanta routes = Eastern Time and Los Angeles routes = Pacific Time.