The concrete divider in a multilane highway is one continuous barrier constructed to be immovable. The barrier is designed to control and slow the crashing vehicle with the minimum damage to the vehicle and to the surrounding vehicles. The ultimate goal is to keep all the vehicles from crossing over into the oncoming traffic. Before the existence of cars and highways, animals could easily go visiting or hunting for food and return home safely. Now, with about 4 million miles of public roads crisscrossing the United States, automobiles and roads have had a very adverse impact on America's animal population.
Roads result in habitat loss and habitat fragmentation.
These animals also run the risk of being killed on or along the roads and highways. Hitting a deer will kill the deer but will also result in major car damage. In Washington State, there are also special fish ladders to help specific endangered fish populations to migrate safely. American people use dietary supplements. The dietary supplement industry is part of the American economy, and annual sales are about 4 billion dollars.