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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.
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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.
No picture, but I saw a shiny new Jag stranded in the middle of the street this morning. Couldn't see what was up until I got to the other side of it...there was a big, scraped dent down the lower RHS and the right rear wheel had been almost completely knocked off. The driver had tried to cut a kerb free corner, and encountered one of those large bell shaped bollards. Did LOL.