NJ 159 is a short semicircular loop off of US 46 in Montville and Fairfield. It begins as Bloomfield Avenue, which runs southeast for a few blocks before splitting off to become CR 506. NJ 159 turns onto Oak Road. After a couple of blocks, Oak Road merges into Clinton Road, which is designated Essex CR 614 to the south. NJ 159 follows Clinton Road back to US 46, where it ends.
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