Bollards are also good ideas to prevent intentional terrorist acts of driving cars into pedestrian areas, https://www.nbcnews.com/slideshow/terrorist-truck-attack-sho....
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The automatic bollards in my city, designed for exactly that purpose, have claimed over 200 tailgating cars since their installation.
How does that happen? Are they tailgating maintenance vehicles or emergency vehicles who are authorized to access those areas, and then the bollards go up again after they've passed?
Yep. The bollards rise much faster than you'd think, so you're in real trouble if you ignore the no entry signs.
I just knew it'd be Manchester!
"tailgating" at a red light or in a parking lot might mean "following the car in front of you closely at low speed", and as such the driver might not realize there is an automatic bollard there. this pleases people because schadenfreude
All of the automatic bollards I've seen are very clearly signed, and frequently have lights indicating their presence. It is very rare that they are not very obvious.
In any case, if you are following another vehicle so closely that you cannot see a hazard in the road in front of you, it is your fault for hitting that hazard (by law in most places).
Most of those places do not have any automatic bollards.
Who would place them at a red light?