Definition: The term 'city triangles' refers to a group of three or more cities where their borders are defined by highways or streets connecting them. The term is most commonly used in geographic information systems (GIS) software and can refer to any two or more cities that share a common border with a third city. A city triangle consists of four points, which form the corners of the triangle. The vertices of a city triangle may be located within or on one side of the line connecting the three cities. Each point on the line is designated as an edge of the triangle. In the case of two cities sharing a border, they would each have two edges pointing inwards towards the other city, and thus two triangles would result. City triangles are often used to represent traffic flow or transportation networks between different cities. They can be useful for visualizing patterns in transportation systems, such as determining the fastest route from one city to another or tracking the movements of vehicles within a network.

City Triangles