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traffic; traffic volume
この道は交通量が多い。
This road has heavy traffic.
交通量の多い場所では事故が起きやすい。
Accidents are more likely to happen in places with heavy traffic.
橋の開通で交通量が増加し周辺に渋滞が起きるようになった。
After the bridge opened, traffic increased and congestion began to occur in the surrounding area.