The NY 142 designation was short-lived, however, as it was eliminated . By 1940, the portion of NY 142's former routing northeast of the NY 9A overlap was replaced by an extended NY 141 while the section east of the concurrency on Grasslands Road was redesignated as NY 100C.
The NY 142 designation did not last long; it was later discontinued. By 1940, the portion of NY 142's route northeast of the intersection with NY 9A was replaced by an extended NY 141, while the section east of the overlap on Grasslands Road became known as NY 100C.