If you travel much between the Tri-Cities and Seattle, you've driven through arches that are going to save many animals from becoming road kill, not to mention the threat of human death in a vehicle/animal collision. Above the arches it will looks like mother nature. Dirt, plants and natural landscape. This should entice wildlife to cross over I-90, instead of trying to cross high speed traffic. It's going to be quite beautiful! Check it out HERE.