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Wildlife crossing is the umbrella term encompassing underpasses, overpasses, ecoducts, green bridges, amphibian/small mammal tunnels, and wildlife viaducts (Bank et al. 2002). All of these structures are designed to provide semi-natural corridors above and below roads so that animals can safely cross without endangering themselves and motorists.
A squirrel bridge is a construction (similar to a wildlife crossing) which enables small animals, especially squirrels and martens, to safely cross busy roadways. The bridges are a measure for wildlife management and natural habitat preservation, and serve the functions of both animal welfare and accident prevention.
Toad tunnel in Germany. Amphibian and reptile tunnels, also known as herp tunnels, are a type of wildlife crossing that is positioned beneath a roadway. The tunnels allow amphibians and reptiles to cross roads without the risk of being crushed by a vehicle. They have been used by toads, frogs and salamanders.
Goat Canyon Trestle is a wooden trestle in San Diego County, California. [1] At a length of 597–750 feet (182–229 m), it is the world's largest all-wood trestle. [1] [8] [10] [11] Goat Canyon Trestle was built in 1933 as part of the San Diego and Arizona Eastern Railway, after one of the many tunnels through the Carrizo Gorge collapsed.
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At 189 feet (58 m) long and 150 feet (46 m) wide, [4] it is the largest wildlife bridge in the United States as of December 2020. [5] With 8-foot (2.4 m) tall, noise damping corten steel walls on both sides, the bridge is designed to appear to crossers as a small hill.
In 1987 an estimated 800,000 people flocked to the the Golden Gate Bridge for its 50th anniversary. The weight of the large crowd caused the bridge to sag 7 feet, flattening its usual convex shape.
The Paw Paw Tunnel is a 3,118-foot-long (950 m) canal tunnel on the Chesapeake and Ohio Canal (C&O) in Allegany County, Maryland. [1] Located near Paw Paw, West Virginia , it was built to bypass the Paw Paw Bends, a six-mile (9.7 km) stretch of the Potomac River containing five horseshoe-shaped bends.