What is the meaning of the following traffic sign?

1. Correct answer: T- junction to the right and then T-junction to the left
2. Warning sign before a sharp right turn followed by a sharp left turn.
3. Left T-Intersection followed by right T-Intersection ahead.
4. Give right-of-way to vehicles from your right and then from your left.

WhyOn the sign a road joins the main road first from the right, then from the left. These are not bends or a right-of-way rule, but a warning that vehicles may come out from the side.