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2. Mileage sign - Wikipedia

   en.wikipedia.org/wiki/Mileage_sign

   Mileage sign. A mileage sign, sometimes also called a route confirmation sign or simply a distance sign in certain contexts, is a type of road sign along highways that displays the distance from the current point on a highway to a certain city, destination, or a junction to another highway. Their purpose is to inform drivers of the distance to ...

3. MapQuest - Wikipedia

   en.wikipedia.org/wiki/MapQuest

   Optional. Launched. February 6, 1996; 28 years ago. ( 1996-02-06) Current status. Active. MapQuest (stylized as mapquest) is an American free online web mapping service. It was launched in 1996 as the first commercial web mapping service. [1] MapQuest vies for market share with competitors such as Google Maps and Here.

4. Travelling salesman problem - Wikipedia

   en.wikipedia.org/wiki/Travelling_salesman_problem

   In the Euclidean TSP (see below), the distance between two cities is the Euclidean distance between the corresponding points. In the rectilinear TSP, the distance between two cities is the sum of the absolute values of the differences of their x- and y-coordinates. This metric is often called the Manhattan distance or city-block metric.

5. Great-circle navigation - Wikipedia

   en.wikipedia.org/wiki/Great-circle_navigation

   Great-circle navigation or orthodromic navigation (related to orthodromic course; from Ancient Greek ορθός (orthós) 'right angle', and δρόμος (drómos) 'path') is the practice of navigating a vessel (a ship or aircraft) along a great circle. Such routes yield the shortest distance between two points on the globe.

6. Rail speed limits in the United States - Wikipedia

   en.wikipedia.org/wiki/Rail_speed_limits_in_the...

   Passenger trains are limited to 59 mph and freight trains to 49 mph on track without block signal systems. (See dark territory .) Trains without "an automatic cab signal, automatic train stop or automatic train control system "may not exceed 79 mph." The order was issued in 1947 (effective December 31, 1951) by the Interstate Commerce ...

7. Haversine formula - Wikipedia

   en.wikipedia.org/wiki/Haversine_formula

   The haversine formula determines the great-circle distance between two points on a sphere given their longitudes and latitudes. Important in navigation, it is a special case of a more general formula in spherical trigonometry, the law of haversines, that relates the sides and angles of spherical triangles.