Evidence for a fundamental property of steering

Benderius, Ola; Markkula, Gustav · 2014 · Crossref

DOI: 10.1177/1541931214581186

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Summary

This study investigates whether steering wheel corrections exhibit fundamental kinematic properties similar to those observed in human reaching movements. Motivated by established research indicating that hand velocity during reaching follows a distinct bell-shaped profile, the authors sought to determine if steering corrections are governed by similar motor primitives. Specifically, the research addressed three questions: whether steering rate profiles are generally bell-shaped, whether a linear relationship exists between maximum steering rate and deflection (implying constant movement time), and whether complex steering maneuvers consist of superimposed motor primitives. The researchers analyzed steering wheel angle and rate data from six distinct datasets comprising both passenger cars and trucks. These datasets included driving simulator studies involving distraction tasks, sleep deprivation, and electronic stability control testing, as well as field operational test (FOT) data and closed-track driving. Individual steering corrections were extracted using specific thresholds for steering rate and deflection to exclude noise and large maneuvers. The study examined over 1.2 million identified corrections across the datasets. To test for bell-shaped profiles, each correction’s rate profile was fitted to a Gaussian function. Corrections that did not fit a single Gaussian were further analyzed to see if they could be described by two, three, or four overlapping Gaussian functions. The results demonstrated that 60% to 73% of steering corrections across all datasets could be accurately described by a single bell-shaped Gaussian rate profile. For these single-primitive corrections, the standard deviation of the Gaussian fit was relatively constant, indicating a consistent movement duration regardless of the correction's magnitude. Consequently, a strong linear relationship was found between the maximum steering wheel rate and the total steering wheel deflection. For the remaining corrections that could not be modeled by a single profile, the majority were successfully described by two overlapping Gaussian functions, with very few requiring three or four. The study also noted that truck drivers performed significantly more steering corrections per minute than car drivers, likely due to higher steering ratios. The findings provide evidence for a fundamental property of steering: it is composed of intermittent, open-loop control bursts rather than continuous closed-loop control. The constant duration of corrections and the linear relationship between rate and deflection suggest that the amplitude of a steering correction is predetermined, akin to motor primitives in reaching tasks. This implies that complex steering behavior is built from the superposition of these basic primitives. These results have significant implications for driver modeling, suggesting that models should account for the discrete, primitive-based nature of steering inputs rather than treating them as purely continuous control actions.

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• steering pattern