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The results from this field operational test (FOT) show differences in the longitudinal control of headway between manual driving and driving with an adaptive cruise control (ACC) system. Based on measurements made during naturalistic driving by laypersons, it is found that the ACC mode of driver assistance contributes to longer following distances and is perceived to improve driver comfort and convenience. Observations on desirable improvements for ACC systems are presented.

The tests described here have been used to provide a preliminary checkout of the control functionality of a prototype adaptive cruise control (ACC) system being used in a field operational test of intelligent cruise control. The results presented provide an initial characterization of the headway control performance of the ACC system. The inputs to these tests are the speed of the preceding vehicle. The results of the tests are based upon measurements of range, range rate, velocity, transmission shift commands, and velocity commands resident within the ACC system. Numerical performance measures are derived from these data and used to characterize system performance quantitatively. Results from these types of tests could be used in assessing differences in headway control characteristics associated with various ACC systems.