In Britain, a bus powered by cow manure has set a land speed record for a regular bus.
The bus runs on biomethane a compressed natural gas and is painted black and white - just like a Friesian cow, the BBC reports.
The Bus Hound was recorded doing a lap speed of 123.57km/h at a test ground] in Bedford, southern England.
The Bus Hound zips around the track at the world famous Millbrook Proving Ground in Bedford. Photo: AFP
The bus normally carries passengers around in the nearby town of Reading and is speed-limited to 90km/h.
Martijn Gilbert, chief executive of Reading Buses, said it would not be recognised as a Guinness World Record unless it reached speeds above 241km/h.
Engineer John Bickerton said the company wanted the "world's first service bus speed record" to bring to light the viability, power and credibility of buses fuelled by cow poo.
The fuel is made from animal waste which is broken down in a process called anaerobic digestion to produce biogas, which is then liquefied, Mr Gilbert said.
It is stored in seven tanks fixed inside the roof of the bus.
- BBC