New York Codes, Rules and Regulations
Title 17 - DEPARTMENT OF TRANSPORTATION
Chapter V - New York State Supplement To The National Manual On Uniform Traffic Control Devices For Streets And Highways-2009 Edition
Part 2 - Signs
Chapter 2C - Warning Signs And Object Markers
Section 2C.124 - SNOWPLOW TURN Sign (NYW9-26)

Option:

01 The SNOWPLOW TURN (NYW9-26) sign (see Sign Drawing SD-W39) may be used to warn of locations where snowplows regularly turn around.

Guidance:

02 The SNOWPLOW TURN sign should be used only where terrain and roadway features limit approach sight distance and it is impractical to move the turning point to a more visible location.