Ergonomic evaluation of a prototype guidance system in an urban area. Discussion about methodologies and data collection tools

The authors discuss two available methodologies used for ergonomic evaluation of in-vehicle systems. One method corresponds to the objective measurement of the driver's behavior, and more precisely the visual strategies, and the other one belongs to the subjective evaluation category and is used for rating the mental workload of a task. For this second approach, the authors propose a new version of the TLX adapted to the driving task and called the DALI-Driving Activity Load Index. Both objective and subjective approaches are illustrated with results extracted from the ergonomic evaluation of the guidance/navigation system CARMINAT tested in the Lyon urban area.