A barrier has to start somewhere. The blunt end is considered a hazard for cars if it is too close to the lane, called the clear zone. That blunt end is considered very dangerous and either needs to be located out of the clear zone or have expensive and large crash cushions protecting the blunt end.
It is going to be very difficult finding a civil engineer who will approve installing a blunt end right next to an active travel lane. That makes it useless if you’re trying to protect a bike lane next to traffic.
There is a little more to it than that.
A barrier has to start somewhere. The blunt end is considered a hazard for cars if it is too close to the lane, called the clear zone. That blunt end is considered very dangerous and either needs to be located out of the clear zone or have expensive and large crash cushions protecting the blunt end.
It is going to be very difficult finding a civil engineer who will approve installing a blunt end right next to an active travel lane. That makes it useless if you’re trying to protect a bike lane next to traffic.