Construction bosses at the new Queensferry Crossing have come up with a plan by using nearby cranes to install temporary toilets at the top of each of its 206m (676ft) towers.
The move has prompted onlookers to ask if they are now the highest toilets in the country.
There are about 150 people working on each tower and, of those, a maximum of 12 people work at the very top of the tower at any given time.
Each tower has a barge at the base with a number of male and female toilets and washrooms and canteens.
The additional temporary toilets on the tower were installed when the towers got to about 120m (394ft) above sea level.
Robert Adam, aerial photographer with Historic Environment Scotland (HES) - the new public body formed by bringing together Historic Scotland and the Royal Commission on the Ancient and Historical Monuments of Scotland - was flying over the Firth of Forth recently when he spotted the toilets hundreds of feet above the water.
He said: "The aerial survey team at HES record all aspects of the historic landscape, from architecture to archaeology.
"We've been recording the new Forth crossing since they began building it, and this isn't the first toilet we've photographed - but it's probably the highest."
A Transport Scotland spokesman said the Queensferry Crossing was one of the biggest construction projects Scotland had ever seen, directly employing over 1,200 people.
He said: "When open to traffic at the end of this year, it will be tallest bridge in the UK and the longest bridge of its type in the world.
"The project is on time and under budget thanks in large part to the efforts of a workforce facing often extreme weather conditions at great heights over the Firth of Forth.
"Taking all this into account, providing a toilet only seems fair.
"In all seriousness, health and safety is the absolute priority on the project and a fundamental part of that is providing appropriate welfare facilities for workers whatever their location."

The Millers, who were relegated to League One on 1 April, are looking to end a run of 10 successive defeats.
Birmingham City could be without striker Clayton Donaldson because of a knee injury.
Full-back Josh Dacres-Cogley has an ankle problem while centre-back Michael Morrison remains the only long-term absentee.

The ivory, with a black market value of $30m (Â£19.4m), is the largest consignment to be destroyed in Kenya.
"Many of these tusks belonged to elephants which were wantonly slaughtered by criminals," he said at the ceremony in Nairobi National Park.
Elephant ivory is often smuggled to Asia for use in ornaments.
Rhinos are also poached for their horns for use in traditional medicine.
Conservationists have warned that elephants could be wiped out in some parts of Africa in the next few years.
"Twenty-five years after the historic banning of the ivory trade, demand from the emerging markets once again threatens Africa's elephants and rhinos," President Kenyatta said.
The burning of the ivory was to show that wildlife trophies must be put "beyond economic use", he said.
"We want future generations of Kenyans, Africans and indeed the entire world to experience the majesty and beauty of these magnificent animals.
"Poachers and their enablers will not have the last word in Kenya."
Mr Kenyatta promised that his government would destroy the country's entire stockpile of ivory - thought to be another 115 tonnes - by the end of the year.
"We are committed to combating the menace robustly and persistently until we dismantle the entire vile economy," the president said, adding that Interpol's new regional office on environmental crime in Kenya was a significant boost in the battle.
Last month, China imposed a one-year ban on the import of ivory, amid criticism that demand from its consumers was fuelling poaching in Africa.
What do you do when you are building the highest bridge in the UK but the tower you are working on gets so tall it would take you ages to get to the toilets at the bottom?
[NEXT_CONCEPT]
Rotherham midfielders Lee Frecklington (knee and calf) and Tom Adeyemi (calf) could be fit to return.
[NEXT_CONCEPT]
Kenyan President Uhuru Kenyatta has set fire to 15 tonnes of elephant ivory as part of the East African nation's efforts to curb poaching.