Pat Tuson / Number 476 red bus to Euston entering Euston Bus Station, London Borough of Camden, England, UK, March 2015.

Pat Tuson / Single-decker bus entering congestion charge zone, Old Street Roundabout, London Borough of Islington, England, UK, June.

Pat Tuson / Single-decker bus entering congestion charge zone, Old Street Roundabout, London Borough of Islington, England, UK, June.

Pat Tuson / Group of school children wearing high visibility jackets crossing the road, sometimes called walking bus, Hyde Park Corner, London, UK, June 2015.

Pat Tuson / Traffic on Euston Road, one of the most polluted road, in the country, London, England, Britain, UK, August 2014.

Pat Tuson / Santander Cycles or Boris Bikes, bicycle hire scheme docking station with number 29 bus, corner of Hampstead Road and Euston Road, Camden, England, UK, March 2016.

Pat Tuson / Passengers on pedibus, City of London, England, Britain, UK, June 2015.

David Pattyn / Verreaux's sifaka (Propithecus verreauxi) running across a road with bus in background, Berenty Private Reserve, southern Madagascar, August 2016.

SCOTLAND: The Big Picture / Touring bus showing wildlife branding on side, Jasper National Park, Alberta, Canada, June

SCOTLAND: The Big Picture / Location sign for Lake Louise featuring a grizzly bear, Lake Louise, Banff National Park, Alberta, Canada, June

Terry Whittaker / Trees providing shade for bus passengers, Elephant and Castle, London UK

Nick Turner / Rural public transport, Northleach, Gloucestershire, UK. March 2014.