The commuter rush or rush hour when trains, buses, and roads become very crowded during morning and evening commuting times.
毎朝、通勤ラッシュで電車が満員になる。
Every morning, trains become packed because of the commuter rush.
通勤ラッシュを避けるために、早めに家を出た。
I left home early to avoid the commuter rush.
道路は通勤ラッシュのせいでひどく渋滞していた。
The roads were badly congested because of the commuter rush.