Past this interchange, the route enters Union Township and continues east through developed areas, intersecting CR 638 before narrowing into a two-lane undivided road and intersecting CR 630.
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Route 124 crosses the Passaic River and runs along the border of Millburn, Essex County to the north and Summit, Union County, coming to a large interchange with the Route 24 freeway and CR 649 (John F. Kennedy Parkway).
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Upon splitting from Route 24, Route 124 continues east through Springfield Township, Union Township, and Maplewood to its eastern terminus.
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It runs southeast from an intersection with Route 124 in Springfield Township along Morris Avenue to Route 439 in the Elizabeth general area.