
An American couple has broken the world record for the longest road trip in one country after traveling over 29,500 miles through 39 states.

Greg Cayea and Heather Thompson departed from Gilbert, Arizona on July 7, and have since traveled to 22 national parks including Zion National Park, Crater Lake National Park and Yellowstone in 103 days.

They are still continuing to drive their 2008 Subaru Outback in a bid to cover all 48 contiguous states.

Cayea came up with the idea for the couple to try and break the record while listening to Tony Robbins' audio book, 'Awaken The Giant Within'.

The 32-year-old then decided to research various world records and decided that they should try and break the longest journey completed by car since they were already planning to move to Philadelphia and Thompson was no longer working.

All smiles: Greg Cayea and Heather Thompson (pictured together) broke the world record for the longest road trip in one country after traveling over 29,500 miles through 39 states

They departed from Gilbert, Arizona on July 7, and have since traveled to 22 national parks including Zion National Park, Crater Lake National Park and Yellowstone in 103 days

September 20 was the day they broke the previous record of the world's longest road trip in one country that was set back in April by four men who drove 22,406.66 miles through India

Cayea (left with Thomspon right) came up with the idea for them to try and break the record while listening to a Tony Robbins' audio book. He researched various world records and decided they should break the longest journey completed by car

Prior to hitting the road, the couple decided to sleep on an air mattress in the back of his 2008 Subaru Outback (above)

The above map by Cayea shows the unique route the couple has traveled along during their months-long journey

On a blog he created where he shares some insight into their journey, Cayea said before departing he bought new tires for his 2008 Subaru Outback, got an oil change and bought a new camera.

In Cayea's book, 'No Direction Home: The Drifter Chronicles Volume One', he said that he felt 'most at home' while on the road.

He explained to Travel + Leisure that 'being on the road has been such a big part of my life.'

The couple is partially funding their journey with money made from his book sales.

Lucky for them, on September 20 they broke the previous record of the world's longest road trip that was set back in April by four men who drove 22,406.66 miles through India.

Some days during their trip, they've also camped outside (above) to gain a great nights rest in nature

They've been seemingly resourceful during the trip by making their own meals for the most part (above)

But they've also dined out at a number of restaurants they've come across around the country (above)

Public restrooms have seemingly become a major part of the couple's life on the road, as Cayea took a selfie of them together in one above

While on the road so far, they've found dozens of seemingly unexpected tourist attractions, including an outdoor animal safari in South Dakota or the ghost town of Bayhorse, Idaho.

The couple said the most scenic road they've driven on so far is Beartooth Pass on the Beartooth Highway located in Montana between Red Lodge and the Wyoming state line.

'It's an insanely beautiful drive that goes around lakes that look like melted glaciers, just like the ones of out Glacier National Park,' Cayea said.

Speaking to MailOnline Travel, while on-the-go, Cayea said that one of the best parts of the journey has been showing his friends via social media what all of the 'country's nooks and crannies look like.'

Meanwhile, Thompson revealed she's 'really been loving the National Parks'.

Touching on one her favourite stretches of road, she added: 'The Pacific Coast Highway from Southern California to the tip of Washington was absolutely amazing, the roads were a little scary at times but I can’t wait to do it again!'

Along the way, the couple has driven through various cities in America, and documented in photos and video their journey. Above is a picture Cayea shared of a bison they spotted while on the trip

Since starting the journey, they have traveled to 22 national parks including the Delicate Arch, a freestanding natural arch located in Arches National Park in Utah (pictured above)

The adventurous couple also made a pit-stop in North Cascades National Park (above), which is located in Washington

They've also visited the Redwood Forest in northern California, as the journey has taken them all along the west coast

In order to achieve the goal of breaking the world record for longest road trip, Cayea and Thompson made a list of rules: no backtracking more than 10 per cent of the total mileage and no round-trips.

The pair also vowed to record every stop, keep a log book along the trip, not cross any country borders and record at least 10 minutes of video each day.

They are also allowed to take two weeks of time to rest from the road and have so far spent 35 days on stops during their trip.

Despite being cooped up in a car together, Cayea and Thompson have managed to avoid coming to blows.

Cayea said he likes to get up early and do morning workouts before setting off, in a bid to clear his mind.

Eating regularly also helps to ward off hunger-fuelled bust ups.

However, Thompson admitted that they did 'almost kill each other' in Las Vegas as the desert heat rose.

During a stop in Minnesota, Cayea posed for a photo (above) in front of the Paul Bunyan and Babe the Blue Ox statues

The couple also took the scenic route across the Golden Gate Bridge in San Francisco during their 103 day trip

Their journey has taken them to places probably not explored by many, including the town of Wall, South Dakota (above)

Before setting off from Arizona in July, the couple saved up for their travels.

Cayea was working as a freelance writer while Thompson was a barista in a cafeteria. In a bid to top up their funds, Cayea has been doing marketing jobs on the road for entertainment companies in Los Angeles and New York. The couple has also been kitted out by a few clothing sponsors after detailing their trip via Cayea's blog.

Thompson said they try to do everything as cheaply as possible.

Instead of eating at restaurants they do regular grocery shops and they have taken advantage of the unique lifestyle by using grills inside the national parks to cook food.

Before going to bed each night, they told the magazine that they prep their mattress and watch their favorite Netflix shows.

The duo expects to keep traveling through mid-November, even though they've already demolished the record. Above is a picture Cayea took of a hostel at the Grand Canyon

Asked if they were getting tired of life on the road, Cayea replied: 'Yes and no. I miss my naps. I can’t take my naps while I’m driving and I don’t sleep while Heather is driving. But I love new things every day.

'Every day is an adventure and every hour is longer than the last and shorter than the next. I love uncertainty.'

Despite Cayea loving the ramshackle life, Thompson said she's excited about getting home and hitting the gym.

'I’m down for camping and sleeping in the car in the future but maybe for like a two or three weeks max, today is day 106 and my body is definitely feeling it!'

The duo expects to keep traveling through mid-November, even though they've already demolished the record.