The objective of this report is to address transit agencies' needs for evaluating and upgrading the intrusion detection systems applicable to the spectrum of their facilities (including tunnels, bridges, buildings, power stations, transfer stations, rail yards, bus yards, and parking lots) and their transit vehicles (such as buses, trains, support vehicles, and special purpose vehicles). The Handbook provides guidance on assessing system needs; developing system designs; and estimating system costs, benefits, and risks. The systems discussed in the Handbook range from low-technology to more complex high-technology systems and directly support the deterrence and detection of intrusion into secure areas.