Question 604 in the bank

What is the meaning of the following traffic sign?

A plain white circle with a thick red border, with no symbols or text inside. Meaning: Closed to all vehicles from both directions.
  1. Careful! You are entering a section with a speed limit.
  2. Correct answer: Closed to all vehicles from both directions.
  3. On-way street ahead.
  4. Slow down, hazardous place ahead without designated marking.

Why this is the answer

The correct answer in the official bank: Closed to all vehicles from both directions.

A plain white circle with a red border and no symbol inside is a general prohibition: no vehicle may enter the road from either direction. Prohibition signs are round with a red rim, and a symbol inside limits the ban to a certain vehicle or action. With no symbol, the ban applies to every vehicle. Warning signs, such as for a hazardous place, are triangular.

Topic: Traffic signs. The bank marks it for these classes: Light truck (C1), Heavy truck (C), Bus (D), Motorcycle (A), Tractor (1), Private car (B).