Pete Oxford / African Parks truck towing another vehicle through water, Mbomo, Odzala-Kokoua National Park, Republic of Congo (Congo-Brazzaville), Africa, May 2013.

David Woodfall / Loss adjuster with damaged car from February 2014 flood ready to be towed away. Surrey, England, UK, 16th February 2014.

Pat Tuson / Male cyclist on a Barclay's Cycle negotiating a chicane installed on the Regent's Canal tow-path to slow down cyclists, Kings Cross, London Borough of Camden, England, UK, August 2013.

Pat Tuson / Female cyclist on a Barclays Cycle negotiating a chicane installed on the Regent's Canal tow-path to slow down cyclists, Kings Cross, London Borough of Camden, England, UK, August 2013.

Pat Tuson / Leisure cyclists giving way to people walking on the Regent's Canal tow-path, Kings Cross, London Borough of Camden, England, UK, August 2013.

Merryn Thomas / Outboard motorboat (Orkney Longliner) towing tender off Arthur, Eastern Isles, Isles of Scilly, UK,

Nick Turner / Canal boats moored up on the Stroudwater navigation, Saul Canal Festival, Gloucestershire, UK, July 2008.

Juergen Freund / Snorkler on tow line, behind 'Undersea Explorer' boat, watching Dwarf minke whale {Balaenoptera acutorostrata} Queensland, Australia

Juergen Freund / Snorkler on tow rope watching Dwarf minke whale {Balaenoptera acutorostrata} Queensland, Australia

Juergen Freund / Dwarf minke whale {Balaenoptera acutorostrata} investigating snorkler on tow line, Queensland, Australia

David Noton / The tow path on the Canal du Midi nr Carcassonne, Languedoc, France

David Noton / The tow path on the Canal du Midi nr Carcassonne, Languedoc, France