How to divide the speed of bus lines in Guangzhou?

You can see the difference between Guangzhou-Lishui 23 1 express train and local train just by looking at the sign on the driver's right hand side. The sign of the express line is red and says "Passing through Foshan Mold City" or white and says "Direct Express Line", and there will be a route "Fenggang Jinshazhou" on the side of the car body. The slow-moving sign is white and says "bound for Guangzhou Liuhua Station", and the font is relatively small.

You can identify it by pressing this.