Question: There is much discussion on the local, state , and federal levels about the need to repair and improve the Interstate Highway System. Provide a rationale for this need. 2. Transportation is the most important economic factor for economic development. Do you agree or disagree with this statement? Why or why not? 8. While improved transportation system provide economic benefits, there may be some associated environmental costs. What are the major environmental costs associated with transportation and what are their potential negative impacts?