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Facsimile of manuscript of Peter Charles L'Enfant's 1791 plan for the federal capital city (United States Coast and Geodetic Survey, 1887). [2] L'Enfant's plan for Washington, D.C., as revised by Andrew Ellicott in 1792 Thackara & Vallance's 1792 print of Ellicott's "Plan of the City of Washington in the Territory of Columbia", showing street names, lot numbers, depths of the Potoma River and ...
Avenues named for 48 of the 50 U.S. states plus Puerto Rico crisscross this grid diagonally, and where the avenues intersect, traffic circles often occur. Many circles are named for American Civil War generals and admirals, while several neighborhoods take their names from nearby circles. There are approximately 36 roundabouts currently in the ...
A Google Maps Camera Car showcased on Google campus in Mountain View, California in November 2010. The United States was the first country to have Google Street View images and was the only country with images for over a year following introduction of the service on May 25, 2007. Early on, most locations had a limited number of views, usually ...
The following is a timeline for Google Street View, a technology implemented in Google Maps and Google Earth that provides ground-level interactive panoramas of cities. The service was first introduced in the United States on May 25, 2007, and initially covered only five cities: San Francisco, Las Vegas, Denver, Miami, and New York City. By the ...
While streets in Washington, D.C. are generally laid out in a grid pattern, the state-named avenues often form diagonal connections between the city's many traffic circles and squares as envisioned in the L'Enfant Plan for the city. However, avenues named for Arizona, Hawaii, Mississippi, Oklahoma and Puerto Rico connect to no other state-named ...
Screenshot of Google Maps with traffic option enabled. In 2007, Google began offering traffic data as a colored overlay on top of roads and motorways to represent the speed of vehicles on particular roads. Crowdsourcing is used to obtain the GPS-determined locations of a large number of cellphone users, from which live traffic maps are produced.
U.S. Route 29 (US 29) enters Washington, D.C., via the Key Bridge from Arlington County, Virginia, and exits at Silver Spring, Maryland.It predominantly follows city surface streets, although the portion of the route from the Key Bridge east to 26th Street Northwest is an elevated highway better known as the Whitehurst Freeway.
A traffic camera is a video camera which observes vehicular traffic on a road. Typically, traffic cameras are put along major roads such as highways, freeways, expressways and arterial roads, and are connected by optical fibers buried alongside or under the road, with electricity provided either by mains power in urban areas, by solar panels or other alternative power sources which provide ...
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