AAA on Monday predicted that more than 4.6 million Californians plan to travel 50 miles or more over the upcoming Memorial Day holiday weekend.

That would be the second-highest, all-time travel volume for the holiday, and the most travelers since 2005.

“The beginning of summer has officially begun with millions of Californians ready to hit the roads, spurred by lower gas prices and growing optimism in the country’s economy,” said Cynthia Harris, AAA Northern California spokeswoman. “This season’s record high travel volume is a good barometer as to what we can expect for the rest of the year.”

AAA projects that more than 3.9 million Californians will drive to and from their destinations.

Nationally, AAA estimated that more than 38 million people will journey 50 miles or more during the three-day holiday weekend.