Legislative investigators in New Jersey say they will begin calling witnesses to testify about the lane closings at the George Washington Bridge last fall, proceeding even though a judge ruled that two former aides to Gov. Chris Christie did not have to comply with a subpoena seeking records related to the scandal.

The assemblyman leading the investigation noted on Thursday that while the judge, Mary C. Jacobson of State Superior Court in Mercer County, struck down his committee’s subpoenas as overbroad, the ruling left open ways that the panel could still compel the two former aides, Bridget Anne Kelly and Bill Stepien, to testify.

The judge’s decision on Wednesday produced as much a political hurdle as a legal one. The legislative investigative committee had invested great energy and emotion in the subpoenas — one to Mr. Stepien, Mr. Christie’s former campaign manager and confidant, and the other, to Ms. Kelly, a former deputy chief of staff who sent the email that burst open the scandal in January, calling for “some traffic problems in Fort Lee.”

With taxpayers footing the bill for a special counsel to the legislative committee and the governor, Republicans sympathetic to Mr. Christie and even the Democratic leader of the State Senate have suggested that the committee needs to move on or step aside to wait for the results of an investigation by the United States attorney’s office, which has been gaining steam in recent weeks.