A British couple, who travelled the length of Europe without once getting out of their car, are planning to repeat the feat in the United States.
Dr James Shippen and colleague Barbara May, from Bromsgrove, Worcestershire, completed the 2,000 mile journey from John O'Groats to the tip of southern Italy in May to demonstrate their invention the Indipod, which is believed to be the world's first in-car toilet.
The pair also wanted to draw attention to the plight of people with Crohn's disease and colitis, which can leave some sufferers house-bound because of their need for regular toilet stops.
Now Dr Shippen has revealed a plan to travel from New York on America's east coast to either San Francisco or San Diego on the western seaboard.
It is understood the biomechanical engineers could receive help from US car giants Ford for the trip.
He said the plans for the 3,500-mile trip were at a conceptual stage and the itinerary had yet to be finalised.
They were also exploring the possibilities of highlighting the in-car toilet's uses for people with multiple sclerosis, where bladder problems can occur.
He added: "It would be great if we could get some interest. Even if we can't, we're going to go ahead anyway. It would be a matter of getting to New York and heading west.
"We anticipate it's going to take about 10 days... we're thinking in terms of the autumn. We don't want to be caught up in Death Valley in the heat."
The couple were assisted on their European trip by the National Association for Colitis and Crohn's Disease and other organisations, who helped with fuel stops. The Indipod, which has a £295 price tag and was launched last year, is designed for the boot of people carriers and 4x4s.
When in use, a pod inflates around it for privacy with the help of a fan attached to the vehicle's cigarette lighter.
Waste material is broken down by perfumed chemicals in its tank and it can be emptied in conventional toilets along the way.