User:Hardworkingbee/favorites/I-66 Route

I-66 Route trip

Numbered highways in the United States

 *  Interstate Highways 
 * The Interstate Highway System is a federally funded and administered (but state-maintained) system of freeways that forms the transportation backbone of the U.S., with millions of Americans relying on it for commutes and freight transport daily. Interstate highways are all constructed to precise standards, designed to maximize high-speed travel safety and efficiency.  Interstate Highways also contain auxiliary routes, which are normally assigned a three-digit route number.  All Interstate Highways are part of the National Highway System, a network of highways deemed essential to the defense, economy, and mobility of the country.


 *  U.S. Highways 
 * The U.S. Highway System (officially "United States Numbered Highways") is an older system, coordinated by the American Association of State Highway and Transportation Officials and maintained by state and local governments. Because of the prominence of the Interstate System, many U.S. Routes have been downgraded to state-numbered routes over the years, most famous being the decommissioning of the well-known U.S. Route 66.


 *  State Highways 
 * Each state also has a state highway system. State highways are of varying standards and quality. Some state highways become so heavily traveled they are built to Interstate Highway standards. Others are so lightly traveled that they are roads of low quality.


 *  County (Parish in Louisiana) Highways 
 * The final administrative level in some states is the county-maintained county highway. County (parish) routes vary widely from well-traveled multilane highways to dirt roads into remote parts of the county (parish).

Highways are generally organized by a route number or letter. These designations are generally displayed along the route by means of a highway shield. Each system has its own unique shield design that will allow quick identification to which system the route belongs. Below is a list of the different highway shields used throughout the U.S.