What is the speed limit on continuous downhill slopes?

[Abel]

The traffic laws do not have explicit regulations on this, at most stating that a safe driving speed should be maintained. Generally, when vehicles approach downhill or continuous downhill sections, traffic police departments will set up warning signs before entering the section, along with speed limit signs. Drivers should follow the indicated speed limits. When driving, pay attention to the following: 1. Do not overtake when the vehicle ahead is turning left, making a U-turn, or overtaking, or when the vehicle ahead is a police car, fire truck, ambulance, or engineering rescue vehicle on duty. 2. Do not overtake if there is a possibility of encountering oncoming traffic while overtaking. 3. Do not overtake in sections or locations where overtaking is not allowed, such as railway crossings, intersections, narrow bridges, curves, steep slopes, tunnels, pedestrian crossings, or urban areas with heavy traffic, or where the speed limit does not exceed 30 km/h. 4. On roads without central isolation facilities or center lines, if the vehicle ahead receives an overtaking signal from the vehicle behind, it should slow down and move to the right to give way when conditions permit.