crossing guard
US /ˈkrɔːsɪŋ ˌɡɑːrd/
UK /ˈkrɔːsɪŋ ˌɡɑːrd/

1.
guarda de trânsito, agente de travessia
a person, typically a civilian, who is stationed at a street intersection or crosswalk to help pedestrians, especially children, cross the street safely
:
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The crossing guard stopped traffic so the children could cross.
O guarda de trânsito parou o tráfego para que as crianças pudessem atravessar.
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She works as a crossing guard near the elementary school.
Ela trabalha como guarda de trânsito perto da escola primária.