What maneuver does this vertical regulatory sign expressly prohibit?

Question

DentroTest · Accepted Answer

The sign shown is R-304 ("No U-turn" or "No change of direction"). This sign expressly prohibits making a U-turn, that is, turning around to continue traveling in the opposite direction on the same road. A key point frequently asked about in the DGT exam is how to tell it apart from sign R-303 (no left turn): while the no-left-turn sign also prohibits making a U-turn, sign R-304 prohibits ONLY the U-turn, and allows a left turn if the road and the signage permit it. Nor does it prohibit reversing, a maneuver that has its own general regulatory restrictions.

What maneuver does this vertical regulatory sign expressly prohibit?

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