What are the four-door buses in Guiyang?

1. General-purpose bus: There are many kinds of buses, which can run on most lines in urban areas, with large interior space and can accommodate more passengers.

2. Minibus: This kind of bus is more flexible, suitable for small routes in the city, smaller in body and more convenient to walk in busy urban areas.

3. Express bus: This kind of bus runs on the express line between the urban area and the outer suburbs, which is faster and can save passengers' time.

4. Dedicated bus: This kind of bus will operate on a specific line, from the outer suburbs to the urban area, or from the urban area to the outer suburbs, suitable for passengers with specific needs.