What is the meaning of the following traffic sign?

1. Correct answer: Road closed in both directions for all vehicles.
2. No entry for motor vehicles (one-way street ahead).
3. No entry for non-motor vehicles (one-way street ahead).
4. No entry to the lane beneath the sign.

WhyThis is sign 401: the road is closed to all vehicles in both directions. That is why it stands at both ends of the closed section. No entry into a one-way road is a different sign, 402.