THEY call it the Knowledge and every inch of the 2,000 mile route all London cabbies must master is being turned into a work of art by Hyundai in a car which causes no pollution.

The ultimate zero emission Black Cab journey through the streets of London is being staged by the car maker in its ix35 Fuel Cell vehicle which runs on hydrogen and emits nothing but water.

And to mark Hyundai UK's 10 anniversary operating in Britain as a wholly owned subsidiary of its Korean parents, the entire journey is being captured on camera to create the world's first montage of more than 650,000 street pictures.

The final image - more than 24 feet long and six feet high - will go on display in London's City Hall at the end of the epic run in which every street and landmark within six miles of Charing Cross will be photographed.

A time-lapse video lasting 200.5 seconds is also being created and will be available to view online.

The 50 day project, dubbed a Streetcar Named Hyundai, is due to finish on November 19 and was kicked off in central London in September by Hyundai UK's chief executive Tony Whitehorn and brand ambassador Nicola Adams, the British Olympic boxing gold medallist from Leeds.

We joined the journey for a leg through London borough of Camden to drive the hydrogen-powered ix35 along the streets of Hampstead and Kentish Town.

The car is the first fuel cell vehicle to go on general sale in Britain and was released in the summer priced from £53,105.

Already eight are on the road and this one is fitted with specialist camera equipment using software specially developed by Hyundai for the drive.

At speeds of less than 25mph it takes a picture every six to eight metres which Hyundai estimates will amount to more than eight million megabytes of data which will be used to create the final montage.

Every street - including dead-ends - within the six mile radius is being driven along a route specially mapped out by Ordnance Survey and which the organisation describes as the most challenging routing project it has ever undertaken - more complex than the Olympic Torch run it created for the 2012 London games.

Despite being at the cutting edge of low emission technology, driving the ix35 Fuel Cell is little different than being behind the wheel of any automatic SUV - although this one is left hand drive.

It is driven by electricity which is generated by passing hydrogen through the fuel cell and the only waste product emitted from the exhaust is water vapour.

The vehicle has a top speed of almost 100mph and can accelerate from 0 to 60mph in 12.5 seconds.

Moreover it has an official range of 369 miles and unlike other electrically operated vehicle it does not require hooking up to a charging point for several hours.

There are now five hydrogen filling stations in London which means that the capital is fair game for fuel cell vehicles. Outside of the city they are still few and far between but more will be coming on stream in the next few years with the intention of 65 being operational by 2020.

Refuelling takes only a few minutes and tank full of hydrogen currently costs around £40 which in terms of pence per mile is comparable to the cost of running a diesel SUV.

On our hour long run, in which we completed just less than seven miles, the available range shown on the ix35's trip computer reduced by only five miles and Hyundai claims the fuel cell vehicle is capable of achieving the equivalent of 62 miles per gallon.

Prior to the Streetcar run Hyundai had been running fuel cell vehicles experimentally in London since 2013 and the vehicle currently holds the world record for the longest journey on a single tank of hydrogen with a distance of 435 miles.

As a brand Hyundai has been selling cars in Britain since 1982 and has been operating as Hyundai UK since 2005. Since then it has seen sales surge and it is now one of the top ten car companies in Britain with sales of 82,159 vehicles last year.