What does the sign in the image indicate?
Signage: Vertical signs
This S-991d sign indicates a checkpoint where you must stop at a STOP sign placed by the authorities. It does not refer to controls with a red traffic light, only to specific controls with a STOP sign.
Explanation
Stop control
Sign **S-991d** indicates the presence of a **stop control**, that is, a point where vehicles must **stop mandatorily** at a *STOP* sign placed by the authority (for example, police checkpoints or other traffic controls).
It may include **additional panels above or below** with extra information, such as schedules, type of control, or other specific indications.
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