A key way to help strengthen and diversify local economies and help meet demand for goods and services is through the wise, more complete use of forest resources. The USDA Forest Service, National Wood In Transportation (WIT) Program embodies the concept that wood can be used in a variety of applications to improve transportation networks. These applications include vehicular and pedestrian bridges; portable bridges for timber harvesting operations; railings; sign and light posts; sound barriers; culverts; retaining walls; docks; fresh and salt water marine facilities; and railway ties and bridges.