Highway
Major highways are often named and numbered by the governments that typically develop and maintain them. Australia's Highway 1 is the longest national highway in the world at over and runs almost the entire way around the continent. China has the world's largest network of highways followed closely by the United States of America. Some highways, like the Pan-American Highway or the European routes, span multiple countries. Some major highway routes include ferry services, such as U.S. Route 10, which crosses Lake Michigan.
Delaware State Route System
In 1934, the entire length of US 13 between Dover and Wilmington was widened into a divided highway, which at the time was the best superhighway and the longest stretch of divided highway in the world. During the course of the 1930s, several other state roads were constructed while others were widened into divided highways. In 1935, the DSHD took over maintenance of all remaining county roads, tripling the mileage of the state highway system, and took over several city streets in Wilmington in 1936. Progress on improving the state highway system slowed during World War II; the only major project completed during that time was the construction of the high-level St. Georges Bridge to replace a lift bridge destroyed by a ship in 1939. Following the war, several highway improvement projects took place including widening more roads to divided highways. On August 16, 1951, the Delaware Memorial Bridge and its approach road opened to traffic, providing a fixed road link for US 40 across the Delaware River to New Jersey and replacing ferry service that previously existed. Following the completion of the bridge, traffic along US 13 and US 40 increased, with plans made for a new freeway to handle the increased traffic. In 1957, US 13 was widened into a divided highway between Greenwood and Harrington, providing a divided highway running the north-south length of the state.