In 1932, the Pulaski Skyway was opened to traffic, and US 1/9 were designated to use it along with Route 25. Two years later, trucks were banned from the Pulaski Skyway, and a truck bypass of the structure called Route 25T was created. By the 1930s, US 1/9 was moved to follow Route 25 south to Woodbridge instead of Route 27. By the 1940s, the US 1/9 alignment was moved to its current location north the Tonnele Circle, following Route 1 and Route 6 to the George Washington Bridge into New York City. In the vicinity of the George Washington Bridge, the route also ran concurrent with US 46. In addition, US 9 was built to connect to US 1 in Woodbridge on its current alignment (then designated Route 35) instead of using Route 4 (the current Route 35).