The New York City tolling program began on Jan. 5 after defying obstacles for decades. A move to stop it would likely touch off a legal battle between the state and federal government.

Drive times into Manhattan have dropped dramatically since the institution of New York’s congestion tolling program, according to data released Wednesday by the MTA — with the most significant improvements at the Holland Tunnel.

The MTA previously reported that the new fees, which launched on Jan. 5, led to 7% fewer vehicles entering the tolling zone south of 60th Street during the first several days they were in effect, compared to a similar period last year.