What are the meanings of the dotted lines superimposed on the Huai'an Road viaduct, and the looming solid lines represent?

We all only know that on the road of driving, the dotted line can change lanes, and the solid line cannot change lanes, and the following picture is obviously a dotted line, and then look at the second and third pictures...... Do you follow the dotted line, or do you follow the solid line?

(Figure 1)

Figure II

Figure III