Intersections

The city increased the number of traffic signals at major intersections.

Unfortunately, increasing the number of traffic signals at intersections didn't help decrease the number of traffic accidents.

Roundabouts are both safer and more efficient than four-way intersections.

Gridlock occurs when cars block intersections.

The board used in the game of Go is checkered, but it doesn't have light and dark squares like chess and checkers boards. In Go, the stones are placed not on "squares", but on the intersections of the horizontal and vertical lines drawn on the board.

The empty intersections adjacent to a stone are its degrees of freedom (at least 1, at most 4). A stone that has no degree of freedom cannot remain on the board.

A territory is the set of intersections that a player has managed to encircle with his stones in such a way that it has become impregnable.

The lines of the board have intersections wherever they cross or touch each other. Each intersection is called a point, even if it is at a corner or an edge of the board.

You can play Go on a sheet of paper by drawing a grid and marking O's and X's on the intersections as you play.

In the game of Go, the rule of Ko (a term meaning eternity in Japanese) prevents repeating indefinitely between adjacent intersections, now the capture of a stone by a player, and then the capture of the capturing stone by the opponent.