Transportation Engineers help move populations from place to place. They work with local and regional planning boards to identify areas of growth and development, or look for opportunities to alleviate traffic snarls. Once they understand the needs of drivers in a region, they design plans and develop cost estimates for construction projects. When a new plan has been funded, transportation engineers can oversee a variety of subcontractors who build new roads, highways, and bridges. After project completion, transportation engineers ensure that roads are properly maintained and repaired as necessary–all while complying with local and federal policies for safe construction and maintenance.