Amphibious bus on the river Clyde

An amphibious bus on the banks of the river Clyde near Glasgow, Scotland
Photograph: Andy Buchanan/AFP/Getty Images

An amphibious bus during a press preview on the river Clyde in Glasgow. The vehicle operates like a standard coach on roads, but in water it is driven by twin water jets at a speed of about 9mph
Photograph: Danny Lawson/PA

An amphibious bus in the water during a press preview on the Clyde in Glasgow, with a slipway it needs to negotiate in the background
Photograph: Danny Lawson/PA

An amphibious bus drivces out of the River Clyde
Photograph: Danny Lawson/PA

A Stagecoach amphibious bus encounters problems during a demonstration on the Clyde in Glasgow
Photograph: Jeff J Mitchell/Getty Images

A mechanic inspects the underside of an amphibious bus after it developed a fault with its suspension during trials on the Clyde
Photograph: Andy Buchanan/AFP/Getty Images

Media film and photograph an amphibious bus, which experienced problems during a test by Stagecoach bus company on the Clyde
Photograph: Jeff J Mitchell/Getty Images