Researchers at the PNW Research Station in Wenatchee, Washington, have developed methods to evaluate landscape permeability—the ability of animals to move across the landscape . Using a geographic information system, in conjunction with snow tracking, automatic cameras, and road-kill surveys, they can now identify areas where animals are most likely to cross major highways. These techniques have been adopted by the Washington State Department of Transportation in a massive reconstruction project on Interstate 90 at Snoqualmie Pass . The new stretch of highway is slated to include several wildlife crossing structures.