Hong Kong double-decker bus, why is there a vacancy on the first floor, but everyone likes to take the second floor?

There is no station on the second floor. Theoretically, you can't stand on the second floor, so there will be fewer people.

Because there are many people on the lower floor, every station is open and closed, and the air conditioning effect is not very good. In some places, it may be hot and cold.

As for the gold coast, the open top floor is for sightseeing, that is, the second floor is semi-open or fully open. When it doesn't rain, the second floor of this sightseeing bus can clearly see the outside, but it is for sightseeing, either specially rented or only available in some tourist places.

Another advantage of the second floor is that there are fewer people and it is quieter. It's better if you want to sleep.