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1. The flow of the bicycles during the early morning rush hour
2. The roads are narrow, so the workers ride on motorcycles
3. There are many people and few train cars, so the people are trying to enter through the windows
4. The train station is full of people going down south to work, so that the bathroom line is longer than 45 minutes
5. During the spring vacation, the train station is full of people
6. Instant lottery ticket purchase line
7. Mine workers just exiting the mine
8. Workers who handle polluting products
9. Road gang on the Qingha-Tibet highway
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