I’m not quite sure where your confusion comes from, but a bollard is just a sturdy post. For the purposes of forming a barrier against heavy vehicles they’d be fixed in place and usually relatively strong.
There’s different kinds. some are weaker/lighter and just meant to make it difficult to accidentally drive into a pedestrian area, basically the same function as a curb but a little stronger or where you don’t want a step up/down for the pedestrians. Others are quite able to stop even heavy trucks.
The other kind you mentioned are probably rising bollards, meant to function as gates or to allow only certain types of vehicles (often buses) to pass.
I’m not quite sure where your confusion comes from, but a bollard is just a sturdy post. For the purposes of forming a barrier against heavy vehicles they’d be fixed in place and usually relatively strong.
There’s different kinds. some are weaker/lighter and just meant to make it difficult to accidentally drive into a pedestrian area, basically the same function as a curb but a little stronger or where you don’t want a step up/down for the pedestrians. Others are quite able to stop even heavy trucks.
The other kind you mentioned are probably rising bollards, meant to function as gates or to allow only certain types of vehicles (often buses) to pass.