AAA is expecting record-breaking numbers for holiday travel during the Fourth of July holiday weekend. "We're expecting just about 48 million Americans to hit the road, and 90% of them are going to be traveling by car," said Tiffany Stanley, a spokesperson for AAA East Central. "Which means that's going to be 42 million Americans traveling by vehicle."While millions are getting behind the wheel, many also chose to go by plane and packed Pittsburgh International Airport.Stanley said the main traveling days have passed, but to still expect traffic backups throughout the weekend. "We've already passed the most busiest day which was Thursday," Stanley told Pittsburgh's Action News 4. "If you are planning on hitting the road, Saturday between 2 p.m. and 4 p.m., that's going to be the busiest times, the heaviest traffic."AAA said, nationwide, they expect to receive nearly 450,000 roadside assistance calls throughout the weekend due to the number of cars on the road. "This is going to be a record-breaking number of people hitting the roads so we also expect a record-breaking number of emergency road service calls," Stanley said.Stanley advised to have your vehicle inspected before traveling to check things like fluid levels, tires and battery. Battery service, lockout service and tire change are amongst the most common calls AAA receives."It can be a bit surprising that we're having a record-breaking number of people traveling by car despite, inflation and high gas prices, but really when you think about, it there's so much pent-up demand from people wanting to get out and travel again," she said. Pittsburgh's Action News 4 also noticed some traffic along the water to kick off celebrating the holiday."The weather is nice, no rain plus it's a holiday so there'll be a lot of people out," said June Spelick, a boat owner. "Everybody gets together and mingles with everybody and parties with each other."