NJ 18 is a major highway in New Jersey, extending from NJ 138 to Rutgers University in Piscataway. The southern portion is a limited-access highway known as the Monmouth Freeway. Further north, it has a combination of grade-separated interchanges and traffic lights. The section in the New Brunswick is known as Memorial Parkway and is a limited-access highway again. In Piscataway, Memorial Parkway becomes Hoes Lane, a four-lane divided surface road. Hoes Lane ends at Centennial Avenue, changing names to become Old New Brunswick Road. NJ 18 turns west onto Centennial Avenue for a short distance, following it to exit 8 of the Middlesex Freeway (I-287), where NJ 18 ends.
NJ 18 was planned to extend several miles south of where it currently begins to the junction of NJ 34, NJ 35, and NJ 70. Therefore, the exit numbers of the Monmouth Freeway begin at 6. The remaining exit number here reserved for the unbuilt section.
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