The Transportation Security Administration is preparing to screen 42 million passengers at airport security checkpoints nationwide over the holiday travel season.

The holiday period starts Dec. 19 and runs through Jan. 5. The forecast for crowds going through airports during that period is up 3.9 percent from a year ago.

Travelers should allow extra time to get through security screening and ensure that they don't bring prohibited liquids, weapons or other restricted items through checkpoints.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools