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As the technology and system concepts evolve for the Automated Highway System, condition monitoring is playing a significant role. The determination of the capability of a vehicle to enter the highway system, of the highway system to accept it, and in the functional condition of various vehicle and roadside subsystems during operation is dependent upon the monitoring effectiveness. A simple steering failure simulation example indicates the impact on the highway design, the level of redundancy that might be necessary in the vehicle controller, and the capability of the driver to be a part of the fault detection and reconfiguration process.

Supportability of DoD weapon systems has become a national issue. The ability to perform diagnostic and maintenance tasks impacts our world position both through our efficiency and our effectiveness. The following statements indicate that current maintenance methods are not capable of performing as required: One-third to one-half of F-15/F-16 maintenance man-hours were expended on chasing problems where no defects were found. [AFSB86] 20% - 50% of avionics maintenance actions resulted in removal of items with no evidence of failures. [RIDD86] Nearly two thirds of the 900 responding technicians indicated they used Fault Isolation Manuals less than 50% of the time to troubleshoot faults.