David Noton / Cyclists riding bikes along riverside path at dawn, near Vang Vieng, Laos, March 2009.

Kirkendall-Spring / Close up on mountain biker's foot pedalling, in Cascade foothills, Washington, USA. April 2013. Model released.

SCOTLAND: The Big Picture / Family mountain biking through forest, Cairngorms National Park, Scotland, UK, November 2011.

Tim Laman / Cycling on a carriage road along a lake in Acadia National Park, Maine, USA. October 2013. Model released.

Tim Laman / Boy rides his bike over a leaf covered park road in Acadia National Park, Maine, USA. October 2013. Model released.

John Cancalosi / Luhya man cycling, carrying large load of grass for thatching building, Kakamega forest, Kenya, July 2017.

Pat Tuson / Commuter cyclists waiting for the lights to change, Hyde Park Corner, Wellington Arch in background, Central London, England, UK, June 2015.

Pat Tuson / Brompton Bike Dock, lockers holding Brompton folding bicycles for hire outside the Whittington Hospital. The solar panels above provide all the energy needed to power the Dock. Islington, England, UK,...

Pat Tuson / Bikes attached to railings showing the need for more bicycle racks in the vacinity of the station, Kings Cross, London, England, UK, August 2014.

Pat Tuson / Bike racks and taxies with St Pancras Station behind London, England, UK, August 2014.

Pat Tuson / Commuter cyclist in advanced stop lane with bus behind, London Borough of Islington, England, UK, July 2015.

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