traffic beam

dated

(automotive, dated) A headlight setting intended for roads with traffic on them at night.

Japanese Meaning

夜間に交通のある道路を走行する際に、他の車両に配慮したヘッドライトの設定 / 夜間走行時に、対向車などへの眩惑を避けるために用いられるヘッドライトの照射モード

She switched to traffic beam when approaching the oncoming cars to avoid blinding them.

彼女は対向車が来たときに相手の目を眩ませないようにロービームに切り替えた。

Sense（1）

(automotive, dated) A headlight setting intended for roads with traffic on them at night.

For your own safety and that of others, follow the suggestion in the verse:

“Use country beam

When roads are clear,

Use traffic beam

When cars are near.”

traffic beams

（ plural ）