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The highway system of the United States is a network of interconnected state, U.S., and Interstate highways. Each of the fifty states, the District of Columbia, Puerto Rico, American Samoa, Guam, and the U.S. Virgin Islands own and maintain a part of this vast system, including U.S. and Interstate highways, which are not owned or maintained at the federal level.

Interstate Highways have the highest speed limits and the highest traffic. Interstates are numbered in a grid: even-numbered routes for east–west routes (with the lowest numbers along Mexico and the Gulf of Mexico), and odd-numbered routes are north–south routes (with the lowest numbers along the Pacific Ocean). Three-digit Interstates are, generally, either beltways or spurs of their parent Interstates (for example, Interstate 510 is a spur into the city of New Orleans, Louisiana, and is connected to Interstate 10).

U.S. Numbered Highways are the original interstate highways, dating back to 1926. U.S. Highways are also numbered in a grid: even numbered for east–west routes (with the lowest numbers along Canada) and odd numbered for north–south routes (with the lowest numbers along the Atlantic Ocean). Three-digit highways, also known as "child routes," are branches off their main one- or two-digit "parents" (for example, U.S. Route 202 is a branch of U.S. Route 2). However, US 101, rather than a "child" of US 1, is considered a "mainline" U.S. Route.

State highways are the next level in the hierarchy. Each state and territory has its own system for numbering highways, some more systematic than others. Each state also has its own design for its highway markers; the number in a circle is the default sign, but many choose a different design connected to the state, such as an outline of the state with the number inside. Many states also operate a system of county highways.

National Forest Scenic Byway marker

Scenic byways can be designated over any classification of road in the United States. There are the National Scenic Byways, National Forest Scenic Byways and Bureau of Land Management Back Country Byways at the national level. Most states have their own system for designating byways, some more systematic than others. Indian tribes may designate byways as well.

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Interstate 235 crosses the Des Moines River in downtown Des Moines

Interstate 235 (I-235) in Iowa is an auxiliary Interstate Highway that runs just north of downtown Des Moines through the heart of the Des Moines metropolitan area. I-235 runs from the junction of Interstate 35 and Interstate 80 in West Des Moines to the separation of the same two interstates in Ankeny. The highway is approximately 14 miles (23 km) long. I-235, which had seen little improvement since its construction in the 1960s, was completely rebuilt and widened in a project that spanned most of the 2000s. Prior to the reconstruction, I-235 had two lanes in each direction with a third lane near downtown; the entire route now has at least three lanes of traffic in each direction, with an additional one or two lanes closer to the heart of the city.

Recently selected: U.S. Route 163 • Maryland Route 500 • California State Route 282

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Westbound view on beginning of US 50 in Ocean City, with an overhead sign giving the distance to the western terminus in Sacramento, California

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Nominations and votes for selected articles and selected pictures are always needed. Anyone can nominate an article, and anyone can vote for an article. You can also recommend items for Did you know?. If you have news related to U.S. roads, you can add it to the news section above.

See also Wikipedia:WikiProject U.S. Roads/to do, Category:U.S. road articles needing attention and individual state highway project to-do lists.

Related portals

Numbered highways in the United States

References and notes

  1. ^ Marusak, Joe (May 31, 2019). "First part of I-77 toll lanes finally opened Saturday. Here's what you need to know". The Charlotte Observer. Retrieved June 1, 2019.
  2. ^ Lindblom, Mike (February 4, 2019). "New tunnel? No problem? It was an easy, light-traffic day Monday on Highway 99". The Seattle Times. Retrieved February 6, 2019.
  3. ^ Smith, Jerry (January 10, 2019). "U.S. 301 Mainline toll road opens Thursday to cheers and jeers". The News Journal. Wilmington, DE. Retrieved January 10, 2019.
  4. ^ "Route 219 extension opens". The Tribune-Democrat. Johnstown, PA. November 21, 2018. Retrieved November 22, 2018.
  5. ^ Campbell, LouAnna (November 7, 2018). "Lindale relief route open, Toll 49 extended from I-20 to US Highway 69, north of Lindale". Tyler Morning Telegraph. Retrieved January 31, 2019.
  6. ^ "Hogan Administration Announces Long-Awaited US 219 Realignment Construction Project in Garrett County" (Press release). Maryland State Highway Administration. October 13, 2018. Retrieved October 13, 2018.
  7. ^ Sofield, Tom (September 22, 2018). "Decades in the Making, I-95, Turnpike Connector Opens to Motorists". Levittown Now. Retrieved September 22, 2018.
  8. ^ Williams, Kevin (August 2, 2018). "E-ZPass is coming to some local toll roads starting Sept. 1". Orlando, FL: WFTV. Retrieved August 31, 2018.
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