Subjective and objective assessment of manual, supported, and automated vehicle control
conference paper
In this paper subjective and objective assessments of vehicle control are illustrated by means of ex-periments concerning manipulation of vehicle dynamics, driver support, and automated driving. Subjective ratings are discussed in relation to objective performance measures.
The relationship between driver opinion of vehicle handling characteristics and objective measures has been studied. Handling conditions were manipulated by means of varying tyre pressure and lane width. Subjective assessments were determined by means of a two level rating scale. Drivers were found to compensate for varying handling conditions, maintaining a constant performance level by adapting their steering effort. The objective performance measure Time-to-line-crossing (TLC) proved to be a valid predictor for subjective ratings. Changes in vehicle dynamics did not influence visual sampling strategy as derived from a visual occlusion technique.
It was found that active steering support reduced visual workload and improved steering perform-ance, with small effects on steering strategy and steering effort.
Finally, the subjective assessment of fully automated driving in traffic lanes of varying configuration showed that a physical separation between lanes did not affect comfort when driving under automated control, but it was a discomfort factor in manual driving. Driving in the same lane conditions manually, subjects chose speed reduction over increasing steering effort to maintain the proper level of performance.
The relationship between driver opinion of vehicle handling characteristics and objective measures has been studied. Handling conditions were manipulated by means of varying tyre pressure and lane width. Subjective assessments were determined by means of a two level rating scale. Drivers were found to compensate for varying handling conditions, maintaining a constant performance level by adapting their steering effort. The objective performance measure Time-to-line-crossing (TLC) proved to be a valid predictor for subjective ratings. Changes in vehicle dynamics did not influence visual sampling strategy as derived from a visual occlusion technique.
It was found that active steering support reduced visual workload and improved steering perform-ance, with small effects on steering strategy and steering effort.
Finally, the subjective assessment of fully automated driving in traffic lanes of varying configuration showed that a physical separation between lanes did not affect comfort when driving under automated control, but it was a discomfort factor in manual driving. Driving in the same lane conditions manually, subjects chose speed reduction over increasing steering effort to maintain the proper level of performance.
Topics
TNO Identifier
9470
Publisher
Swets & Zeitlinger
Source title
Vehicle Performance
Editor(s)
Pauwelussen, J.P.
Pages
97 - 120
Files
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