Frequent collisions show there needs to be more, not less.
Portland
It also shows that the layout of these calming devices was poorly designed. There are lots of ways to calm traffic without causing continual accidents
are they really accidents if they are predictable
Yes, otherwise they'd call them intentions lol
No one's like "I'm going to ram into this giant concrete barrier now," they do it accidentally
Edit: I don't understand why this is so unpopular
if u make shitty street designs, give driving licenses to people who shouldnt even operate a tricycle let alone a 2+ ton metal vehicle, let such people drive at reckless speed, sdont enforce traffic laws, and then put a concrete planter in the middle of the street that isnt an accident.
Imagine being so bad at driving that you can't avoid hitting a bright yellow concrete cylinder sitting in the middle of the road when you're doing 25kph.
They should just replace it with steel planter so they have to replace it less often
TLDR; They didn't actually expect them to work. Every time they get hit, they move and they require a crane or forklift to put back into position.
Perhaps they should double the weight of them so they're less likely to move when struck.
You need a real roundabout, not this half assed giant plat pot.
If drivers couldn't stop hitting the planters, then the planters aren't the problem. But hey, at least Portland is accomodating to maniac drivers.
Stopping with 30 kph puts a pressure of over a metric ton via the seat belt on your body for a short time.