What does it mean when there are dashed lines on both sides of a solid line?

[Juan]

Dashed lines on both sides of a solid line not only serve as a reminder but also indicate that lane changes are not allowed on this section of the road. Locations where they appear: They are generally found on curves, uphill and downhill roads, highways, and ring roads. On curves and slopes, they serve as a more conspicuous warning. When they appear on certain sections of highways or ring roads, they help prevent fatigue driving and are sometimes used in conjunction with transverse markings. Road traffic regulations to remember: Do not cross, lean on, or sit on guardrails of sidewalks, roadways, or railway crossings. Do not climb onto, chase, forcibly stop, or throw objects at vehicles on the road. When crossing pedestrian crossings without traffic signals, pay attention to vehicles and do not run or rush.