In the 1937 renumbering of Monmouth County roads, numbers 1 through 5 were reserved for the longer, "cross-county" routes; those numbered 6 and above were to be more local in nature.
During the 1937 reorganization of Monmouth County's road network, routes 1 to 5 were assigned for the main, cross-county roads; routes 6 and higher were meant to serve more localized purposes.