Passage: A rush hour (American English, British English) is a part of the day during which traffic congestion on roads and crowding on public transport is at its highest. Normally, this happens twice every weekday -- once in the morning and once in the afternoon-evening, the times during which the most people commute. The term is often used for a period of peak congestion that may last for more than one hour.\n\nQuestion: Based on this passage, when does heavy traffic occur in urban cities? Let's give stream of consciousness first:
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To answer the above question, the relevant sentence is: Normally, this happens twice every weekday -- once in the morning and once in the afternoon-evening, the times during which the most people commute.
So, the final answer is twice every weekday -- once in the morning and once in the afternoon - evening , the times during which the most people commute.
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