Which physical security measure uses closely spaced, heavy posts to block vehicle entry at a facility gate while still allowing pedestrians to pass through?
Mantrap vestibule
Proximity card reader
Razor wire fencing
Bollards
Bollards are short, robust vertical posts installed in a line to withstand vehicle impact forces. They protect entrances against ramming attacks yet leave gaps wide enough for people on foot. Razor wire and mantrap vestibules restrict or delay human movement rather than vehicles, and proximity card readers are electronic authentication devices rather than physical barriers.
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