As a subcontractor we installed a traffic signal for GC who was contracted to build a new chain grocery store. The grocery store owner was required to install and pay for traffic signal by county. However once accepted by the county they will maintain the traffic signal, which is located on CR541, Burlington Twp., Burlington Co., New Jersey. Would this be deemed a public or private project. We would like to file a NJ Mechanic Lien but have not sent a preliminary notice. We are at 85 days since last working on project so if its deemed public we are out of time.