Battle Row Campground is located on the east side of Round Swamp Road in Bethpage, just west of the Nassau-Suffolk border. The Motor Parkway ran east and west inside the campground and turned north, crossing Bethpage-Sweethollow Road on the eastern side of the campground. Further east, this road turns into Spagnoli Raod which is featured on another page in this site.
The following two maps show the Motor Parkway and the area before and after the creation of the campground. The Motor Parkway, shown as blue text on the map on the left, is where the roadway crossed Round Swamp Road into today's Battle Row Campground. Following along Sweethollow Road, it ran through the northern edge of the campground and then crossed Sweethollow and ran along the southern border of the current Old Bethpage Restoration Village. Note the historical significance of some street names on the west side of Round Swamp Road, directly south of its intersection with Bethpage-Sweethollow Road. Check out Vanderbilt, Motor Lane and Toll Place (or perhaps Plaza).
The map on the right is a Hagstrom map from the late 40s or early 50s. Battle Row is on the lower right hand side going east/west with the Motor Parkway highlighted in blue. Today's Battle Row Campground appears to occupy the confines of the Post Brick Co., in the middle of the map where the Motor Parkway turns north. Following the Motor Parkway, one can see it crossing Claremont Street, which intersects with Bethpage-Sweethollow Road. At that point, the Parkway runs close to the border of today's Old Bethpage Restoration Village. Comparing this map with the previous map is a very interesting exercise. Start by imagining where the noted Vanderbilt road, Motor Lane and Toll Place on the previous map would lie on this one. Also, this map doesn't appear to have the east/west Bethpage-Sweethollow Road that runs north of Battle Row and intersects with Round Swamp Road.
Below is a map from 1968 still showing parts of the Motor Parkway ("Old Motor Parkway") before entering Battle Row campground (campground not actually shown) and after it crossed Bethpage - Sweet Hollow Road. The full map depicts the Plainview Fire Protection District, first having been produced in 1954, but updated every year or so. North of the Motor Parkway on the right side is the Old Bethpage Restoration Village.