In country with decent civil engineering, we have soft bollards. It will still make a bike fall, but falling on it isn't life threatening. You can also twist t

In country with decent civil engineering, we have soft bollards. It will still make a bike fall, but falling on it isn't life threatening. You can also twist the bollard when you are bored. The downside is that it probably doesn't stop a car with enough speed. https://i.imgur.com/Pe8Ih4C.jpeg https://i.imgur.com/Pe8Ih4C.jpeg