The Parks Department will abruptly shut down a portion of the Hudson River Greenway — the continent's busiest bike path — starting on Monday, Sept. 28 with no provisions for safety for riders.

The agency will close the Cherry Walk path in Riverside Park between W. 100th and W. 125th streets, citing the need for "planned shoreline and path reconstruction work" to fix damage caused by Superstorm Sandy in 2012.

The agency's statement about the work added that Parks would not be doing anything to ensure the safety of cyclists beyond posting "signs" directing riders to busy, dangerous local roads.