Speed limit sign setting

1) There is no sign to lift the speed limit: We often encounter this problem on highways: a bend with a speed limit of 60/40. But after passing the bend, there is no sign to lift the speed limit, I don't know how far it can be lifted.

2) There is no standard indication for segmented speed limit signs: the speed limit zone is divided into several sections, with 90, 100, and 110 sections. It is unclear whether to follow the speed limit after seeing the speed limit sign or to follow the default speed limit according to traffic regulations after passing the speed limit sign for a certain distance.

3) There are too few signs and the speed limit range is not clear: Some speed limit signs are set every 1-2 kilometers on highways, while others are only set every 100 kilometers. How long is the speed limit range? At one point, a speed limit sign of '80' appeared, and at another point it became '60'. There were nearly ten speed limit standards for over 100 kilometers, and the speed limit sign was completely out of place.