bollard

Revision [45]

This is an old revision of bollard made by MicroZeta on 2006-06-01 06:19:53.

 

Usually made of a strong metal pipe or a concrete post, a bollard is embeded into any bed of concrete to prevent, or selectively allow, the passage of vehicles into an area. Rising bollards are a fairly recent invention; the bollards can retract into the ground when full passage is required, and extended when security is needed.
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