2006 New York Code - Protection At Worksite.

 
    §  19-109  Protection at work site. a. Protective measures. Any person
  who removes, opens or otherwise disturbs the pavement of or excavates in
  a public street or uses any part of a public street so  as  to  obstruct
  travel  therein shall provide barriers, shoring, lighting, warning signs
  or other protective  measures  in  accordance  with  the  rules  of  the
  department,  so  as  to prevent danger to persons and property, and such
  barriers, shoring, lighting, warning signs or other protective  measures
  shall  be  maintained in accordance with such rules until the work shall
  be completed, or the danger removed.
    b. Required signs. Legible signs shall be displayed  at  the  site  of
  such  work  in  accordance  with the rules of the department, indicating
  thereon the name of the permittee, the name of the person for  whom  the
  work is being done and the names of any contractors, when employed.
    c.  Disturbance,  prohibited.  It  shall  be  unlawful  to throw down,
  displace or remove any barrier, shoring, plate or  warning  sign  or  to
  extinguish  or  remove  any  light  thereon or on any obstruction in any
  street, without the written consent of the commissioner or  without  the
  consent  of  the  person  superintending the work or materials protected
  thereby.