3/3 Closing essential, safe #bikenyc infrastructure midday NOT an option anymore, @HudsonRiverPark. #visionzero pic.twitter.com/h8uZnYrh6Q

— Joanna Oltman Smith (@jooltman) May 26, 2016

Update: The Parks Department sent us this statement Thursday evening: “Ensuring the safety of all during the holiday weekend, in preparation of increased pedestrian traffic during Fleet Week, NYC Parks has posted signs requesting cyclists dismount and walk their bikes on the west side greenway between 56-46th streets.”

Update: The Hudson River Park Trust sent us this statement Friday: “The Hudson River Park Bikeway is open, but users may be asked to dismount due to Fleet Week crowds. We ask that riders please adhere to the posted signs, and we appreciate their patience as we work to ensure safety along the Bikeway. “

Parks Department officers are ordering cyclists to dismount on the Hudson River Greenway in Midtown and ticketing people who don’t comply.

Streetsblog reader Joanna Oltman Smith tweeted photos of what look like uniformed Park Enforcement Patrol officers issuing a ticket to a cyclist near 45th Street, and another blocking the greenway with a “dismount bike” stop sign. She says the dismount zone is in effect between 46th and 49th Street, interrupting the biggest transportation artery for bikes in the city, if not the nation.

We contacted the Parks Department and the Hudson River Park Trust about the dismount zone. No one who answered the phone could say why cyclists are being asked to dismount, but it seems probable that whatever is happening is related to Fleet Week. The Parks Department press office and the Hudson River Park Trust have both said they’re looking into it.

Making people walk their bikes is not a rational response to past incidents. In 2011 a motorist killed Steve Jorgenson, a Marine in town for Fleet Week, as he and his shipmates exited a cab on the West Side Highway at W. 49th Street.

The greenway is controlled by city and state agencies, and the state has jurisdiction below 59th Street. Whatever the intent behind the dismount zone may be, it’s emblematic of greenway managers’ longstanding failure to recognize this route as a vital bike transportation corridor.