From conversations with insiders, I have learned that these bollards are being installed without consensus among staff and against the recommendations of some staff with cycling expertise. In any case, they are being installed without community input and without any input from the Arlington Bicycle Advisory Committee, of which I am a member. I have previously posted about how bollards are mostly unnecessary and often create more problems than they solve.
(UPDATE: I made comments to the Arlington County Board on May 19. Text of my remarks is here.)
The new East Falls Church bridge went into service last month, and about a week later four bollards were installed: three at one end and one at the other. These three went in first: