Three-way junction

Some three-way junctions are controlled by traffic lights, while others rely upon drivers to obey right-of-way rules, which vary from place to place: In the United States and some other countries, it is common to have stop signs facing each direction, although according to game-theoretical analysis, drivers have strong incentives to run the stop sign, while randomly removing one stop sign may lead to significant efficiency gains.

In such cases, often that lane is also specially delimited with pavement markings or other lane separation devices, to keep left-turning traffic on the intersecting road from colliding with traffic proceeding through the intersection on the main road.

There are now safer variations of this, called continuous green-T (or seagull) intersections, that have a left turn lane off the main road either channelized or otherwise separated from traffic going straight, which allows for a traffic signal on only one side of the road.

[7] In Thailand, three-way junction was called in an old word Sam Phraeng (Thai: สามแพร่ง, pronounced [sǎːm pʰrɛ̂ŋ]).

Sam Phraeng is unsuitable area according to the beliefs of Thai people since ancient times on account of it is a passageway of ghosts or demons, therefore, normally no one will build a house or residence in the Sam Phraeng area.