Overhead highways are elevated roadways designed to reduce traffic congestion on the ground level. These structures allow vehicles to travel above existing streets and intersections, improving the flow of traffic and minimizing delays. They are often supported by columns or beams, providing a clear path for cars and trucks while keeping the area below free for other uses. These highways are commonly found in urban areas where space is limited. By elevating the roadway, cities can maximize land use and reduce the need for extensive ground-level road expansions. Examples of overhead highways include the Interstate Highway System in the United States and various expressways in major cities worldwide.