Unless otherwise specified, the transportation utility shall comply with any letter or electronic or other written communication from the Department directing investigation of any matter under the Department's jurisdiction, and file a report of the investigation with the Department no later than 15 days from the date of the communication. If the utility cannot comply, the utility must advise the Department in writing of the reasons for noncompliance within the 15-day period.
N.J. Admin. Code § 16:65-14.4