Consideration of the Available Evading Space for the Evaluation of the Driver Reaction to Emergency Steering Interventio
One of the goals of the subproject KON was the investigation of the applicability of existing controllability evaluation methods of assistance systems operating in urban areas. Due to the use of these systems in urban traffic conditions different boundary
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27
Andreas Pütz
27.1
Introduction and Motivation
The urban driving environment differs considerably from the application focus of Advanced Driver Assistance Systems (ADAS) in production such as highways and interurban roads. While urban arterial roads are comparable to interurban roads regarding lane width and lane number there are also smaller roads which impose much narrower boundaries for the driver in the fulfilment of the driving task. In addition, the fast changing driving context and a high amount of information to be perceived and processed increase the traffic complexity that the driver has to deal with. On the other hand, these conditions might also activate the driver in comparison to more monotone driving environments and might therefore result in faster reactions to unexpected events. Supporting the driver under these driving conditions by intervening in the lateral vehicle dynamics in situations when an accident is inevitable by braking (e. g. a pedestrian entering the driving path from a sight obstruction) could reduce the number of severe accidents. At the same time these interventions could pose a threat on other road users due to unexpected and inadequate driver reactions. Thus, it should be tested how drivers react to those system interventions. Due to longer durations of the related steering intervention it should also be considered whether possibilities to retract the intervention may increase the controllability. During false positive activations a retraction might help the driver to reduce the consequences of the intervention. On the other hand, a retraction in case of normal system use (true positive) might reduce the effectiveness of the intervention. Therefore, the differentiation between driver reaction to normal system use and to false positive activations can provide benefit to the overall controllability and effectiveness of these systems. A. Pütz () Institute for Automotive Engineering (ika), RWTH Aachen University Aachen, Germany © Springer Fachmedien Wiesbaden GmbH 2018 K. Bengler et al. (eds.), UR:BAN Human Factors in Traffic, ATZ/MTZ-Fachbuch, DOI 10.1007/978-3-658-15418-9_27
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A. Pütz
The following chapter will derive research questions and hypotheses concerning the driver reaction to system initiated evasive manoeuvers (Sect. 27.3) after summarizing existing knowledge on the influence of the driving context on the driver reaction (Sect. 27.2). Afterwards, the experimental design that has been used to analyse the research questions will be presented (Sect. 27.4). Results of the experiment are broken down into the description of observed reaction patterns (Sect. 27.5), the influence of the available evading space (Sect. 27.6) and the influence of the possibility to retract the intervention (Sect. 27.7). Finally, the insights of the conducted experiment are used to show a possibility to distinguish between situations of false and true positive interventions (Sect. 27.8).
27.2
Existing Knowledge on the Influence of the Driving Context in the Controllability Assessm
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