N.J. Stat. Ann. § 48:4-30

Failure to file a report or bond in the manner prescribed by the Director of the Division of Motor Vehicles, or to pay proper excise, or any legal penalties imposed by sections 48:4-20 to 48:4-34 of this Title, or to adhere to any reasonable rules and regulations imposed by the director, or preventing an examination or investigation of books, records, papers, vouchers, accounts and documents, or refusing to exhibit such books, records, papers, vouchers, accounts and documents, or ignoring subpoena whether served within the State or without the State, shall be good cause for the director to revoke the registration certificates for autobusses issued to such owner or operator, or to prevent the operation in this State of autobusses registered in another State.