Sign in or 
| Version | User | Scope of changes |
|---|---|---|
| May 25 2010, 12:58 PM EDT (current) | ElenaHG | 59 words added, 58 words deleted, 1 photo added, 1 photo deleted |
| May 22 2010, 11:25 PM EDT | karinoly | 63 words added, 8 words deleted, 3 photos added |
Changes
Key: Additions Deletions
DEFINITION
An underpass or other crossing method specifically designed to help animals cross roads and highways safely. Often fences will run on either side of the road in order to funnel migrating animals across the wildlife crossing.
AKA
Amphibian tunnels, wildlife passages, wildlife overpass and underpass
PERFORMANCE CRITERIA
DEFINITION An underpass or other crossing method specifically designed to help animals cross roads and highways safely. Often fences will run on either side of the road in order to funnel migrating animals across the wildlife crossing.AKAother names, related ideas, etc.PERFORMANCE CRITERIAhow is it measured? what are the criteria for its design or planning?
ILLUSTRATION
The diagram below illustrates a typical at-grade wildlife crosswalk. On each side of the highway are an animal detection zone, a detection camera, a flashing light, and wildlife exclusion fencing. When a large animal, such as a moose or elk, steps into the detection zone, the flashing lights warn approaching drivers to slow down. (Source: http://www.tfhrc.gov/pubrds/09septoct/03.htm)
CASE STUDIES
links to separate pages documenting specific places or projects where this element is on display
ADDITIONAL RESOURCES
http://www.fhwa.dot.gov/environment/wildlifecrossings/main.htm - U.S. DOT FHWA, "Critter Crossings"
US DOT Federal Highway Administration- Advances in Wildlife Crossings
Wildlife passages. De-fragmentation in the Netherlands. How to evaluate their effectiveness?
An underpass or other crossing method specifically designed to help animals cross roads and highways safely. Often fences will run on either side of the road in order to funnel migrating animals across the wildlife crossing.
AKA
Amphibian tunnels, wildlife passages, wildlife overpass and underpass
PERFORMANCE CRITERIA
| UNDERPASS SIZE CLASS | DIMENSION RANGE | FUNCTION | PASSAGE EXAMPLES | SPECIES EXAMPLES |
| Class 1 - Small | 5' high or less | For small terrestrial animals desiring cover | Pipes, Small bridges & dry culverts. | Amphibians, reptiles, & small mammals. |
| Class 2 - Medium | Box culvert larger than 5' high to 8" by 8' | Allows passages by larger animals; Provides some cover. | Standard box culverts | Small to large carnivores |
| Class 3 - Large | Box culverts over 8' high & open span bridges | Allows plant growth and stream movement. | Standard box culverts, arch pipes, and bridges. | Large carnivores & ungulates (moose, elk, etc...) |
| Source: Adapted from www.wildilfeandroads.org | ||||
ILLUSTRATION
The diagram below illustrates a typical at-grade wildlife crosswalk. On each side of the highway are an animal detection zone, a detection camera, a flashing light, and wildlife exclusion fencing. When a large animal, such as a moose or elk, steps into the detection zone, the flashing lights warn approaching drivers to slow down. (Source: http://www.tfhrc.gov/pubrds/09septoct/03.htm)
CASE STUDIES
links to separate pages documenting specific places or projects where this element is on display
ADDITIONAL RESOURCES
http://www.fhwa.dot.gov/environment/wildlifecrossings/main.htm - U.S. DOT FHWA, "Critter Crossings"
US DOT Federal Highway Administration- Advances in Wildlife Crossings
Wildlife passages. De-fragmentation in the Netherlands. How to evaluate their effectiveness?
