This road sign means:

This sign means "Do not enter". When you encounter a square sign with a white horizontal line inside a red circle, do not proceed in that direction. You'll typically see this sign at roadway openings that you should not enter, such as exit ramps where you would be going in the wrong direction, crossovers on divided roadways, or at various locations on one-way streets. Disobeying this sign could lead to driving in the wrong direction, posing a significant risk of head-on collisions with vehicles headed your way. If you accidentally pass this sign, exercise extreme caution and turn around safely.

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