work toward environmental stewardship, they cannot always do the job alone.

Recommendation: Transportation agencies should continue to expand beyond their historical roles as planners and engineers, increasing their roles as environmental coordinators and stewards. Transportation planners and natural-resource planners should collaborate to promote integrated planning at comparable scope and scale so that the efforts can support mutual objectives. This collaboration should include federal, state, and county resource-management agencies; nongovernmental organizations; and organizations and firms involved in road construction. Incentives, such as funding and technical support, should be provided to help planning agencies, resource agencies, nongovernmental groups, and the public to understand ecological structure and functioning across jurisdictions and to interact cooperatively.