Britain's first "poo bus" which runs on human and household waste is to be launched later this month.
Along its 15-mile route, the Bio-Bus will use waste from more than 32,000 households.
Sewage and inedible food waste will be turned into biomethane gas, which powers the vehicle.
The bus, which can seat up to 40 people, will fill up at a site in Avonmouth, Bristol.
It was first unveiled last autumn but Transport Company First is showing off the bus in Bristol on Tuesday.
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It will operate four days a week and, if the route proves a success, First will consider introducing more "poo buses".
"The Bio-Bus previously made an appearance running between Bath and Bristol Airport at the end of last year, but it's only actually been used once before in the centre of Bristol itself.
"The very fact that it's running in the city should help to open up a serious debate about how buses are best fuelled, and what is good for the environment."
