The Do Not Enter sign is used to prevent:

Large vehicles from entering narrow bridges.
Vehicles from entering one-way streets and highway ramps in the wrong direction.
Vehicles from entering bike lanes.
Pedestrians from entering highways.
Explanation

The "Do Not Enter" sign is used to prevent drivers from entering one-way streets or highway ramps in the wrong direction - something that could lead to a serious head-on collision. Never ignore or drive past a "Do Not Enter" sign, as doing so creates an extremely dangerous situation.

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