Channelized Left Turn Lanes

美国有一种很有趣的车道设计。泰国也见到过。

Channelized Left Turn Lanes is a five-lane roadway is shown with the fifth, center lane used for left turns. Arrows show that the direction of travel is two through lanes in each direction and left turns from the center lane. The roadway has markings of a solid double yellow line and alternating left turn channels marked with a solid white line to separate the turn lane from through traffic lanes traveling in the same direction. The turn lanes have optional white left-turn arrows marked on the pavement. A broken white line separates through lanes traveling in the same direction.

https://mutcd.fhwa.dot.gov/services/publications/fhwaop02090/twtmarkings_longdesc.htm