Bob Pack forgot to bring his James Taylor CDs. Still, he and his brother and sister were having a blast, rolling among the sandstone mesas, ghost towns and kitschy tourist attractions.

They reminisced about family trips as children back in the 1950s, Pack and his sister, Joann, said, and not even their brother’s “annoying” habits of chewing tobacco and telling dirty jokes could ruin the drive. “I wanted to see West Texas one more time,” he said over breakfast at the Route 66 Casino Hotel.

Over in Arizona, Kay McNellen, a 23-year-old actress from San Diego, said she took to the highway almost every weekend these days, just to see how far she could drive. She has motored across the Mojave Desert, admired Sequoia National Forest and Instagrammed the Grand Canyon. “This is a better view than Netflix will give you,” she said.

The great American road trip is back.

It’s partly that gasoline this driving season is cheaper than it has been in 11 years, according to the AAA motor club, and that the reviving economy is making people more willing to part with their money. But there is more than that at play here.

This may be a cultural shift, as Americans experiment with the notion that maybe money can, in fact, buy happiness, at least in the form of adventures and memories.

It is a change that appears to have taken root in the years since the 2008 financial crisis. “Post-recession, people are focused on memories that cannot be taken away from them, as opposed to tangible goods that expire and wear out,” said Sarah Quinlan, a marketing executive at MasterCard Advisors. “There’s a sense that you can take away my job, you can take away my home, but you can’t take away my memory.”

Whatever their motivation, Americans last year drove a record 3.15 trillion miles, according to the US Department of Transportation, beating the previous mark, set in 2007. So far this year, both travel and gasoline consumption are up again.

The desire to get behind the wheel still comes as something of a surprise. The conventional wisdom was that driving mileage had probably peaked in 2007. The demographic bulge represented by the baby boomers is ageing out of the driving years; people typically drive less as they hit retirement.

At the same time, millennials were not sharing the passion for the open road that previous generations of young adults had. Many, in fact, preferred to live in the nation’s downtowns, eschewing personal cars in favour of shared Ubers or walking to their work and play.

But it turns out that both generations are driving more than anyone expected. “A lot of millennial behaviour was really deferred assimilation,” said Steven E. Polzin, a transportation researcher at the University of South Florida. In other words, just like Mom and Dad, they were destined for a more traditional lifestyle — the marriage, the home, the garage — they just took a little longer to get there.

The phenomenon is being further amplified by, of all things, a desire in some families for cross-generational adventures that harks back to a halcyon age of bundling everyone into the station wagon, counting license tags from faraway states and mediating back-seat fights over who started the fight. Baby boomers, it seems, want to bond with their grandchildren on the road.

Rental-car companies are reporting increased demand for bigger vehicles to accommodate the generations.

Along Route 66 recently, near the parking lot of Petrified Forest National Park in Arizona, Rita Bandy, a 62-year-old widow from Philadelphia, Tennessee, described having just such an experience driving cross-country with her 11-year-old grandson last summer. “He and I together, it was just so wonderful,” she said. “I never saw him so happy, laughing and joking with me.”

Bandy pointed out that she had plenty of toys at home — a pool, a motorcycle. “I have everything,” she said. “All I want now is memories with my grandchildren and to let them see that I was fun and not just old.”

Last year’s trip with her grandson was so great that her older sister Vicky said she was jealous and wanted to do the same thing. So this spring they piled into a Toyota van to take the classic American road trip, Route 66. After visiting Branson, Missouri, and a cowboy museum in Oklahoma City, they stopped at the Petrified Forest on their way to California.

“I always wanted to see the Pacific Ocean, and now we’re doing it!” Bandy said just before entering the national park.

All of this has been good news for the hotels, restaurants, theme parks and other destinations that depend on travellers’ rolling up on four wheels. Attendance at national parks last year reached 300 million for the first time.

The 5.5 million who visited the Grand Canyon in 2015, for example, was a 16 per cent increase from the year before, and park officials project a similar increase this year. On one recent weekend, during spring break, the car line at the south entrance was 2.5 miles long, a wait that local rangers said was extremely rare.

Theme parks are also reporting strong business, with attendance up by about 2.5 per cent in 2015, according to initial estimates. Industry experts project a 2.9 per cent increase this year over last.

The AAA estimated that, over the long Memorial Day weekend, 34 million Americans took road trips of 50 miles or more, a 2.1 per cent increase over last year and the highest number since 2005. Branson, Missouri, the country music mecca, is investing $300 million in renovations and new attractions for the summer, including new indoor and outdoor adventure parks and a new Imax movie theatre.

NBC Universal just opened the Wizarding World of Harry Potter attraction at its Southern California theme park, which was estimated to cost $500 million, and it is just one of several recent expansions of tourist destinations in California — including Disneyland in Anaheim and Legoland California in Carlsbad.

Buc-ee’s, a convenience store chain, just got approval from Katy, Texas, to build a gas station the size of a football field with 100 pumps along Interstate 10.

And then there is that ultimate symbol of the road trip, the recreational vehicle. Wholesale shipments last year reached the highest level since 2006 and appeared to be making further gains this year. In New Mexico, an RV resort is being built beside the Route 66 Casino Hotel, outside Albuquerque, complete with 100 full-service parking sites (as well as two fenced-in dog parks).

Part of the driving phenomenon can be explained by the improving job market and more commuting, but far from all of it. Public transit use was down slightly last year from 2014, while every driver averaged 2.6 per cent more miles on the road. Rural and highway travel was particularly up.

And early indications point to an acceleration of the trends this year.

Changes like these come at an inopportune moment, given the commitment by the US to make steep reductions in carbon emissions after the Paris climate accord last year. The fact remains that coming to terms with climate change, experts say, means people must burn less petroleum in the future.

With Americans driving more miles at lower cost — and in bigger SUVs, RVs and trucks — that goal is going to be harder to reach, at least in the short term.

According to Dan Sperling, director of the Institute of Transportation Studies at the University of California, Davis, most of the increased driving can be accounted for by the steep decline in prices at the pump. Gasoline prices have fallen more than 50 per cent in the past two years, he said, saving the average household with two cars as much as $1,000 a year.

New models of cars and light trucks, which under federal rules must nearly double their fuel efficiency by 2025 to 54.5mpg, “will more than offset the behavioural increase of more driving,” he said. “In 10 years, vehicles will be consuming half as much fuel as they do today.”

Fuel prices certainly figured in Frank Claeys’ decision to take a 10-day road trip with his wife and two sons during their spring break. They were originally just planning to drive to Utah for some backpacking. But with a gallon of gas cheaper than some candy bars these days, they decided to stretch the journey all the way to the Texas Panhandle.

Aaron Conley, the 35-year-old owner of a Cincinnati lawn landscape company, has been taking long road trips. This year he drove to New Orleans for Mardi Gras, then took a swing around the Gulf Coast to Port Arthur, Texas; Lake Charles and Baton Rouge, Louisiana; and finally the Florida Panhandle.

On a recent trip they flew to Las Vegas and then drove to the Hoover Dam; the Grand Canyon; Sedona, Arizona; and finally Death Valley, California. “When gas was $4 a gallon, we didn’t travel at all,” he said.

And — in one sign of how quickly things could change again — they almost didn’t make it to the Grand Canyon this spring. The reason?

They discovered that prices were not quite as low as they thought. “When we saw gas was $2.25 a gallon here, that was at the tipping point,” he said of the difference between prices in northern Arizona and the $1.70 he had been seeing back home.

Mercer was quick to agree. “I’d rather not spend a lot of money on gas,” she said.

— New York Times News Service