主しゅ信しん号ごう

noun

main signal; traffic signal

Refers to the primary signal in a system, such as a traffic light at an intersection or a main signal in railway signaling.

• この交こう差さ点てんの主しゅ信しん号ごうは、朝あさのラッシュ時じに長ながく青あおになります。

  The main traffic signal at this intersection stays green longer during the morning rush hour.

• 鉄てつ道どうの主しゅ信しん号ごうが故こ障しょうすると、運うん行こうに大おおきな遅おくれが出でます。

  When the main railway signal fails, it causes significant delays in operations.