Route 138 begins at exit 35A of
Interstate 195 at
Route 34 in
Wall Township. The eastern continuation of Interstate 195, Route 138 continues as a four-lane
freeway through Monmouth County. The route interchanges with Route 34 southbound at exit 35A and northbound at exit 35B. A short distance later, the highway crosses to the south of a construction site and crosses over the southbound lanes of the
Garden State Parkway (Route 444) and intersects with the on-ramp from the southbound lanes. The highway crosses over the northbound lanes and reaches exit 36, which serves the Parkway and a nearby
park and ride. Continuing on, Route 138 becomes a four-lane
arterial road and intersects with Allenwood Road in a rather dense area of Wall Township. Route 138 continues further, passing to the south and to the north of commercial complexes along with several residential areas. The highway then proceeds to a small interchange with Club Drive, which serves a mix of residential homes and commercial buildings. From there, Route 138 becomes surrounded by patches of trees before interchanging with the southern terminus of
Route 18 soon after. The route passes north along the interchange, where stub ramps along Route 18 can be seen to the south. After crossing Route 18, Route 138 continues on, entering a large commercial district, intersecting with New Bedford Road in the community of
Wall. The highway continues as a four-lane arterial road, serving
Wall High School and local residential homes for a long distance. Route 138 intersects with Marconi Road and Bayshore Court before ending at a large interchange with
Route 35. ==History==