box junction

/B AA1 K S JH AH0 NG K SH AH0 N/
noun
  1. 1

    A junction designed to prevent congestion and gridlock. Vehicles may only enter the box-shaped area (usually marked with crossing diagonal lines) if their exit from the junction is clear, or in some cases if they intend to make a turn.

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Source: https://en.wiktionary.org/wiki/box%20junction