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Well. Bell bollards are installed to protect people walking along the footway and buildings. What you describe was the result of bad driving that if left unchecked by such a bollard would result in bad injuries or possibly even collisions with corner buildings more often. For instance, there's absolutely no reason for a milk float driver to take such a corner so tightly as for the float to tip over. Obviously, it's not a good state of affairs that they should be necessary, but unfortunately people do tend to overrun the footway on corners like this.
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Yeah, if it wasn't there a lot of vans and lorries would've completely mounted the kerb when turning the corner. Weirdly, there's no building right on the corner, I guess it's mainly for pedestrian protection. Oh and the milk float hit it head on and flipped, rather than hitting it whilst turning the corner. :)
There's one of those bell bollard things on the corner by my old office on Bunhill Row, the number of vans and lorries that scraped themselves on it was incredible, and we'd had a milk float tip over and crash into a bunch of scooters and motorbikes after hitting it and a lorry puncture its diesel tanks and piss diesel 50m down the road after hitting it.