Prefabrication assures just-in-time deliveries and reduces the number of workers required on a project site. Work that was previously handled by carefully scheduled skilled trades is already complete, with fewer workers required for installation. The public benefits in ways that customers value: a reduction in the number of workers on-site, parking, and interacting with the public; less noise and vibration since the work is completed away from the public and/or building occupants; and less impact on existing facility operations.