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Freeway surveillance and control systems generally include surveillance of freeway mainline and ramp traffic using electronic loop detectors. The information collected by these detectors is used to indicate overall system status and as input to incident detection algorithms. Another possible use for this data is to provide travel time and delay information for individual freeway segments. This type of data is typically collected through labor intensive and costly 'moving car' field studies. The study investigated the feasibility of using data collected by loop detectors in a typical freeway surveillance and control system as a substitute for speed and travel time data collected through traditional travel time and delay field studies. Several relationships between field and system data collected at an existing freeway surveillance and control system were developed. With some calibration, these relationships should be applicable to other systems.