Requires certain school security measures to be incorporated into new school construction and existing school buildings.

Assembly Bill 4147 requires New Jersey public school districts and development authorities to implement specific security measures in both new school construction and existing school buildings. Key provisions include mandating a single secured main entrance with a vestibule, access control systems allowing remote door locking, bollards to block vehicle access, and a guard shack with gate for perimeter security. The bill also requires uniformed security personnel, clear entrance numbering for emergency responders, and protocols to prevent propped-open doors during school hours. These requirements apply to all public schools statewide, with some features subject to funding and site conditions.