When construction finally got to Newark, there was the new challenge of deciding to build either over or under the Pulaski Skyway. If construction went above the skyway, the costs would be much higher. If they went under, the costs would be lower, but the roadway would be very close to the Passaic River, making it harder for ships to pass through. The turnpike was ultimately built to pass under. As part of a 2005 seismic retrofit project, the NJTA lowered its roadway to increase vertical clearance and allow for full-width shoulders, which had been constrained by the location of the skyway supports. Engineers replaced the bearings and lowered the bridge by , without shutting down traffic. The work was carried out under a $35 million contract in 2004 by Koch Skanska of Carteret. The project's engineers were from a joint venture of Dewberry Goodking Inc. and HNTM Corp. Temporary towers supported the bridge while bearings were removed from the 150 piers and the concrete replaced on the pier tops. The lowering process for an section of the bridge was done over 56 increments, during five weeks of work.