If you're hitting the road Thursday, whether you're going to work or out of town for Christmas vacation, you'll have more company than usual.

AAA reports one-third of Americans will be traveling this holiday season. A lot of them are driving, and a lot of them are leaving Thursday.

It's expected to be the busiest day for driving nationwide, with millions of drivers flooding the interstates.

That's according to global transport company, INRIX.

But your phone could help alleviate some of that annoyance you're anticipating thanks to a navigation app.

"They use all these complex algorithms to figure out, based on traffic, the best route," said Paul Sponcia, CEO of The IT Company in Knoxville.

He said following a traffic app on your phone can make a big difference.

We looked at the four most popular navigation apps: Google Maps, Apple Maps, Waze and Inrix.

They all give you multiple options for starting a drive.

"If you pull up Google Maps or Apple Maps and you put a location in you want to go to, it'll show you multiple routes and say this one is one minute longer," said Sponcia.

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