Hammonton native here (small world, Hi!); I've driven on those roads for a few years.
Even to those who have driven on these roads all our lives it gets confusing, though I do understand that if a road passes by all the major ordinary shopping centers in a small town, it does warrant a lower speed limit. If you thought Rt. 30 is bad, try Central Ave (Rt. 542); that speed limit changes every 500 feet or so, and the police love pulling people over there.
Even to those who have driven on these roads all our lives it gets confusing, though I do understand that if a road passes by all the major ordinary shopping centers in a small town, it does warrant a lower speed limit. If you thought Rt. 30 is bad, try Central Ave (Rt. 542); that speed limit changes every 500 feet or so, and the police love pulling people over there.