Difficult to tell. Not aware of any specifically there to protect us from enrichment - though there could be. Never really thought about it in a shopping streets setting. Bollards have obviously been around for ever, so hard to tell which are which.
One very worrying thing I have noticed this year is bleed kits attached to lamp posts in some places (maybe HW Man installs these, though he wouldn't need his cherry picker?). What does that tell you? That the government have lost control of violent crime and they're preparing us for the swarms to come? Obviously the entrance to the airport is heavily fortified after the Glasgow attack and we now get rinsed for a fiver for a 2 min drop off zone. Yet another 'benefit' of diversity the liberals didn't see fit to warn us about.
Bristol is a bit late in coming to the multi-culti party. Still not too bad compared to other cities. Though the council estates are rapidly beginning to change colour as our generous politicians give away housing designed for locals. And there's St Pauls where it had big riots in The 80s.