The top official at the Port Authority of New York and New Jersey has been subpoenaed to explain why two inbound lanes of the George Washington Bridge from Fort Lee were shut without notice, causing massive traffic tie-ups.

George Washington Bridge (Spencer Platt, Getty Images)

The subpoena was served Wednesday afternoon on Patrick Foye, the authority's executive director. He was directed to appear Dec. 9 for a special hearing on the decision to abruptly shut down the lanes.

The subpoena was ordered by Assembly Transportation Committee Chairman John Wisniewski after a hearing on the closures ended with what he said more questions than answers.

Deputy Executive Director Bill Baroni was the only authority executive to testify. He said the closures were for a traffic study, but some Democrats say the motive was political.