What is the maximum speed limit for urban roads with only one center line?

[DelMaddox]

In the absence of speed limit signs or markings on the road, if there is only one motor vehicle lane in the same direction on an urban road, the maximum speed should be set at 50 kilometers per hour. Introduction to maximum driving speeds: For roads without a center line, the speed limit is 30 kilometers per hour in urban areas and 40 kilometers per hour on highways. For roads with only one motor vehicle lane in the same direction, the speed limit is 50 kilometers per hour in urban areas and 70 kilometers per hour on highways. Introduction to overtaking: On roads without a center line or with only one motor vehicle lane in the same direction, when the leading vehicle receives an overtaking signal from the following vehicle, it should reduce speed and move to the right to give way, if conditions permit. The following vehicle should overtake from the left side of the leading vehicle after ensuring there is sufficient safe distance, and after maintaining a necessary safe distance from the overtaken vehicle, turn on the right turn signal and return to the original lane.