Olympic pool queen Ariarne Titmus had a trip to forget on Sunday and has lashed out at her Uber driver for allegedly breaking the law.

Titmus was heading home from Brisbane Airport when she contacted the ride-sharing service for transport. 

She then posted a video to Instagram showing the driver's mobile phone playing what looked like social media videos while he was driving. 

'My uber driver today was watching Instagram reels the entire ride home from the airport,' she wrote.

'He was constantly burping out loud and I wanted to vomit I felt so carsick.

'One, he's breaking the law. Two, how is he still driving given I rated him 1 star and would expect the same from others?'

Followers then shared their own experiences of Uber drivers breaking the law on their journeys.  

'Had one placing bets and watching the races on his phone a few months back,' one claimed. 

Another posted: 'I had an Uber driver on a video call the whole trip.'

'Very annoying when they talk ... on the phone with their mate with the speaker on loud,' another said.

Daily Mail has contacted Uber Australia for comment. 

Titmus became one of Australia’s greatest swimmers after winning gold in the 400m freestyle at the Tokyo Olympics, famously defeating Katie Ledecky in one of the Games’ most-watched races. 

She added another gold in the 200m freestyle and silver in the 800m, cementing her status as a dominant middle-distance champion. 

In Paris, she completed the rare feat of defending her 400m title while adding world records and multiple global medals across her career. 

She then shocked the world by retiring from the sport earlier this year, aged just 25. 

'In my personal life - and this was really the crux of the decision - you have to be quite a selfish person to be an athlete,' Titmus told News Corp.

'I've lived my life not caring that I never got to spend birthdays with friends or never being able to go to family events ... but I wasn't willing to go back to the life where I made the decision to put my family second.

'I also met my partner right after the [Paris] Olympics. I wasn't willing to put that on the backburner.

'If I hadn't been Olympic champion or world record holder, this wouldn't be the decision I'm making.

'But because I can look at myself and know I've absolutely done everything you can in the sport, and winning more medals wasn't going to change the way I feel, it felt like the right time to step away.'