Konstantin Mikhailov / Map showing Grossglockner High Alpine Road with the Hohe Tauer Ridge, Hohe Tauern National Park, Austria, Europe, May 2009

Ross Hoddinott / Tree and road sign in the snow, icy, wintry roads, early morning light, nr Bradworthy, Devon, UK. December 2010

Ross Hoddinott / Road and road sign in snow, early morning light, nr Bradworthy, Devon, Uk. December 2010

Ross Hoddinott / Tree and road sign in the snow on icy, wintry roads in early morning light, nr Bradworthy, Devon, UK. December 2010

Staffan Widstrand / Moose warning sign on roadside, Sweden.

Gavin Hellier / Neon signs above shops along Nanjing Road, Shanghai, China 2010

Enrique Lopez-Tapia / Zanzibar red colobus (Piliocolobus kirkii) two colobus crossing the road that bisects the forest Jozany, with sign that warns of the danger of collision with the colobus, Jozany Forest, Zanzibar. Hig...

Mark Carwardine / Barrier across road in Preah Monivong Bokor National Park, Elephant Mountains, south-western Cambodia (formerly Kampuchea)

Christophe Courteau / Road leading to the Virunga Conservation Area, home of Mountain Gorillas. In the background, Virunga Volcanoes (left Gahinga Volcano; right Muhabura Volcano). Volcanoes National Park, Ruhengeri Distr...

Chris Mattison / Pennine Way signpost to Mill Hill, near the A57 Snake Pass road, Peak District National Park, Derbyshire, England, UK, February 2012

Todd Mintz / Snowy owl (Bubo scandiaca) resting on road sign Canadian prairie, Saskatchewan, Canada, March

Todd Mintz / Snowy owl (Bubo scandiaca) female resting on road sign with silos in background, Canadian prairie, Saskatchewan, Canada, March

Dave Watts / Southern cassowary (Casuarius casuarius) adult male crossing road near road warning sign, World Heritage National Park rainforest of the Wet Tropics, north Queensland, Australia, digital composite

Dave Watts / Southern cassowary (Casuarius casuarius) adult male crossing road near road warning sign, World Heritage National Park rainforest of the Wet Tropics, north Queensland, Australia, digital composite

Roland Seitre / Road sign warning road-users to slow down in areas where Colobus Monkeys live. Ukunda, Diani Beach, Kenya.

Dave Watts / Little penguin (Eudyptula minor) crossing road warning sign, The Neck, Bruny Island, Tasmania, Australia, January 2011

Dave Watts / Road warning sign for Wedge-tailed eagles (Aquila audax) feeding on road, Tasmania, Australia, February 2011

Roland Seitre / Road sign warning drivers to watch their speed in areas inhabited by the Iberian / Spanish Lynx (Lynx pardina). Sierra Morena, Andalusia, Spain, June 2006.

Roland Seitre / Road sign warning drivers to watch their speed in areas inhabited by the Iberian / Spanish Lynx (Lynx pardina). Sierra Morena, Andalusia, Spain, June 2007.

Roland Seitre / Road sign warning drivers to watch their speed in areas inhabited by the Iberian / Spanish Lynx (Lynx pardina). Sierra Morena, Andalusia, Spain, June 2006.

Sandesh Kadur / An elephant road warning sign. Many roads were first built roughly following the well-worn pathways of migrating elephants. Today, numerous highways laden with lorries crisscross these ancient migrato...

Todd Mintz / Snowy owl (Bubo scandiaca) taking off from a road information sign at sunset, Scandiaca, Canada.

Nick Turner / Pick your own fruit information signs for organc apples and pears along road next to bus stop, Forest of Dean, Gloucestershire, November 2008,

Inaki Relanzon / Wildlife crossing warning road sign and Injured wildlife contact number, Cape Otway, Great Otway National Park, Victoria State, Australia, September 2011.

Inaki Relanzon / Koala warning road sign, Cape Otway, Great Otway National Park, Victoria State, Australia, September 2011.

Tony Phelps / Angulate tortoise (Chersina angulata) adult male crossing road with tortoise traffic warning sign and car passing on Route 62 near Oudtshoorn, Little Karoo, Western Cape, South Africa

Tony Phelps / Angulate tortoise (Chersina angulata) adult male crossing road with tortoise traffic warning sign and car passing on Route 62 near Oudtshoorn, Little Karoo, Western Cape, South Africa

Ann & Steve Toon / Red squirrel (Sciurus vulgaris) road traffic warning sign in the buffer zone of Kielder Forest red squirrel reserve area, Northumberland, UK, July 2011.

Dave Watts / Kangaroo and Wombat road crossing warning sign, Victoria, Australia

Dave Watts / Kangaroo and Wombat road crossing warning sign, Victoria, Australia

Dave Watts / Koala road crossing warning sign, Southern Australia

Dave Watts / Koala road crossing warning sign, Southern Australia

Dave Watts / Wombat road crossing warning sign, Southern Australia

Dave Watts / Wombat crossing road warning sign, Southern Australia

Michael W. Richards / Amusing road safety sign above road on road to Hyderabab, capital of Andhra Pradesh, India

Adrian Davies / Otter (Lutra lutra) crossing sign on road. Shetland, Scotland, UK, June 2011.

Ernie Janes / Flood warning sign beside road crossing flooded Old Bedford River, Norfolk, Winter

Ernie Janes / Flood warning sign beside road crossing flooded Old Bedford River, Norfolk, Winter

Jeff Wilson / Main road to the Eureka weather station, Ellesmere Island, Nunavut, Canada, June 2008. Taken on location for BBC series, Frozen Planet, Summer

Jeff Wilson / 'Lemming Crossing' sign on main road to the Eureka weather station, Ellesmere Island, Nunavut, Canada, June 2008. Taken on location for BBC series, Frozen Planet, Summer

Ernie Janes / Warning sign for road / track closed due to coastal erosion, Happisburg, Norfolk, UK

Bryan and Cherry Alexander / Road sign warning of Polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.

Bryan and Cherry Alexander / Road sign warning of polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.

Bryan and Cherry Alexander / Road sign warning of polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.

Bryan and Cherry Alexander / Road to Nowhere street sign in Iqaluit with fish logo and syllabics. Nunavut, Canada, April 2008.

Peter Cairns / 2020VISION / Green pub sign beside road in The National Forest, Moira, Derbyshire, UK, November 2011

Matthew Maran / Sign by a road at the border of the Pacific Rim National Park Reserve. West coast of Vancouver Island, Canada, October.

Ross Hoddinott / 2020VISION / The National Forest road sign at Castle Gresley with blurred car in the background, autumn, Derbyshire, UK, November 2010.

Juergen Freund / Myall Creek and bridge flooded from constant and torrential rains. This is the only road that leads to the outside world south of Weipa. Queensland, Australia, February 2008

Ben Hall / 2020VISION / Logs for sale sign beside a busy road with passing traffic, The National Forest, Central England, UK, November 2010

Ben Hall / 2020VISION / Road leading to village of Woodhouse Eaves with houses surrounded by trees, The National Forest, Leicestershire, UK, November 2010

Ben Hall / 2020VISION / Road leading to village of Woodhouse Eaves with houses surrounded by trees, The National Forest, Leicestershire, UK, November 2010

Florian Möllers / Wild boar (Sus scrofa) piglets beside road in the Grunewald forest, Berlin, Germany, March

Andrew Walmsley / Cassowary warning road sign in Daintree National Park, Queensland, Australia, November 2006

Philippe Clement / Barrier with buckets for migrating amphibians / toads (Bufo bufo) crossing the road during annual migration in the spring, Belgium, March 2010

Philippe Clement / Warning sign and barrier for migrating amphibians / toads (Bufo bufo) crossing the road during annual migration in the spring, Belgium, March 2010

Philippe Clement / Warning sign and barrier with buckets for migrating amphibians / toads (Bufo bufo) crossing the road during annual migration in the spring, Belgium March 2010

Bryan and Cherry Alexander / Sign warning of dog sleds on ice road between Thule Air Base and Dundas. Northwest Greenland, 1980.

Adrian Davies / Road sign indicating protected landscape. The Burren, County Clare, Republic of Ireland. June 2010

Adrian Davies / Road sign indicating protected landscape. The Burren, County Clare, Republic of Ireland. June 2010

Staffan Widstrand / Road sign warning of Camels, Dubai, United Arab Emirates, February 2007

Gerrit Vyn / A sign along the road alerting motorists to a Least Tern (Sternula antillarum) and Black Skimmer (Rynchops niger) nesting colony adjacent to the road. Gulf Islands National Seashore, which was affecte...

Bryan and Cherry Alexander / Sign warning motorists of Reindeer crossing the road. Inari, Finland, 1996.

Jerry Monkman / View through the Coombs Covered bridge in autumn / fall. It spans the Ashuelot River (118 feet in length) Winchester, New Hampshire, USA. October 2009

Steven David Miller / Conservationists protest sign "Stop Road to Climate Chaos" against the felling of old growth trees in Tasmania's pristine Florentine, southwest Tasmania, Australia March 2007

Adrian Davies / Road warning sign Panther / Puma crossing, Everglades, Florida, USA

Kirkendall-Spring / Lava flow over the Chain of Craters Road, with road closed sign, in Hawai'i Volcanoes National Park. The Big Island of Hawaii, USA, December 2008

Kirkendall-Spring / Lava flow over the Chain of Craters Road, with road closed sign, Hawai'i Volcanoes National Park. The Big Island of Hawaii, USA, December 2008

Pete Oxford / Humorous traffic signs erected by Donana Biological Station, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Humorous traffic signs erected by Donana Biological Station, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic signs, Donana National Park, Huelva, Andalusia, Spain

Pete Oxford / Spanish Lynx (Lynx pardinus) traffic signs, Sierra de Andujar Natural Park, Andalusia, Spain

Philippe Clement / Warning sign for European pond turtles (Emys orbicularis) crossing the road, La Brenne, France

Peter Cairns / naturepl.com / Sign warning of Red squirrels crossing road, Scotland, UK, May 2008

Peter Cairns / naturepl.com / Sign warning of Red squirrels crossing road, Scotland, UK, May 2008

Peter Cairns / naturepl.com / Road sign warning of Red squirrels crossing, Scotland, UK, May 2008

Nick Garbutt / Polar Bear warning road sign on outskirts of Longyearbyen, Spitsbergen, Svalbard, Arctic Norway, June 2009

Nick Garbutt / Polar Bear road warning road sign on outskirts of Longyearbyen, Spitsbergen, Svalbard, Arctic Norway, June 2009

Juan Manuel Borrero / Road with a traffic warning sign for the conservation of Spanish lynx (Lynx pardina). Sierra de Andujar Natural Park, Jaen, Spain. 2009.

Juan Manuel Borrero / Road traffic warning sign for the conservation of Spanish lynx (Lynx pardina). Sierra de Andujar Natural Park, Jaen, Spain. 2009.

Tom Gilks / People holding sheets stating 'bp out of tar sands' at road side, part of 'The Wave' climate change march ahead of the Copenhagen climate summit, London, UK, 5th December 2009

Tom Gilks / Road closed for 'The Wave' climate change march ahead of the Copenhagen climate summit, cyclists part of the protest, London, UK, 5th December 2009

Gabriel Rojo / Road sign warning of wildlife, with Guanaco (Lama guanicoe) picture, Monte Leon National Park, Santa Crus Province, Patagonia, Argentina, December 2006

Eric Baccega / Map of Herm beside road. Herm, Channel Islands, May 2009.

Stephen Belcher / Signs for annual red crab migration, Christmas Island, Australia

Oriol Alamany / Road sign warning of Kangaroos crossing, Stuart Highway, near Coober Pedy, South Australia, Australia, November

Tony Phelps / Snake crossing warning sign "Give us a brake" next to road, DeHoop, Western Cape, South Africa

Steven David Miller / Sign warning travellers of Bilbies {Macrotis sp} on Peron Road, Francois Peron National Park, Western Australia, November

Steven David Miller / A sign warns drivers to watch for passing Malle fowl; one of the species that has been reintroduced to the park under Project Eden, Peron Road, Francois Peron National Park, Western Australia

Paul Hobson / Pink road sign on Isle of Mull, Inner Hebrides, Scotland, UK

Jouan & Rius / "Beware of Kangaroos" road sign, Flinders Ranges National Park, South Australia, Australia

Jouan & Rius / "Beware of Kangaroos" road sign, Flinders Ranges National Park, South Australia, Australia

Jouan & Rius / Road sign in Central Australia Desert with distances to various cities, Northern Territory, Australia

Ben Osborne / Warning sign for Road closure due to coastal erosion undermining the cliff, Yorkshire, UK

Ben Osborne / Warning sign for Road closure due to coastal erosion undermining the cliff, Yorkshire, UK

Ben Osborne / Warning sign for Road closure due to coastal erosion undermining the cliff, Yorkshire, UK