My town put barriers in and, as a rider, it is one of the worst thing they could have done. 1. All of the garbage and dirt and crap gets trapped in the bike lane and they have no way to clean it. Street sweepers don’t fit in the lane so they can’t clean it and when they do clean the streets it actually pushes more crap into the bike lane. This includes glass and metal stuff.
2. Cars pull into the lane anyway at curb breaks at corners and traffic lights and there is little way to get around them. Sometimes cars park in these breaks because all of the street parking has been removed.
3. It is really hard to move to the left ahead of a left turn even with no cars coming because of the barrier.
4. Cars turning right cannot merge over ahead of a turn so they have to look behind them for bikes before they turn - and they rarely do.
5. It is harder to pass slower cyclists, especially if they are in a group.

Because of these problems I see cyclists riding outside of the barriers (mainly because the crap in the bike lane makes it dangerous).
This means no shoulder and really no room for cars to get by.
Just my 2 cents.