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Technical Paper

Development of a Steering Entropy Method for Evaluating Driver Workload

1999-03-01
1999-01-0892
The authors have developed a steering entropy method to easily and accurately quantify the workload imposed on drivers who are engaged in activities apart from the normal driving operations of longitudinal and lateral control. A driver's steering behavior tends to become more discontinuous while performing an activity in addition to driving. To quantify these discontinuities, steering entropy values are obtained from a time-series history of steering angle data. A special-purpose driving simulator and a test procedure have been developed that allow workload evaluations to be conducted efficiently. The simulator and test procedure were used to evaluate the additional workload incurred by 14 different types of activities. The steering entropy results were compared with a dual task method as well as a subjective evaluation method.
Technical Paper

Development and Evaluation of a Car Navigation System Providing a Bird's-Eye View Map Display

1996-02-01
961007
A new map display technique has been developed for car navigation systems that presents a bird's-eye view of three-dimensional map images. This view allows both detailed and wide-area information to be presented simultaneously in a single screen display. It provides drivers with a reassuring feeling while driving along their route because the two types of information can guide them accurately to their destination. The results of evaluation tests have confirmed the effectiveness of this technique. On the other hand, some aspects requiring further improvement were also identified. This paper discusses how the technique was developed and describes the tests conducted to evaluate its effectiveness along with the results obtained.
Technical Paper

Research and Development Work on Navigation Systems at Nissan

1993-11-01
931921
Nissan is offering navigation systems in some domestic production models. These systems, which show drivers the vehicle's present location on a CRT map display, free them from anxiety about getting lost when traveling in an unfamiliar area. It is expected that future navigation systems will incorporate two key capabilities. One will be a route guidance capability, which will not only indicate the present location but also select the optimal route to the intended destination and guide drivers there by indicating which direction to take at each intersection along the way. The second capability will be a communications link with the roadside infrastructure for receiving outside information such as traffic congestion data and incorporating that information into route guidance. Nissan has established the core technologies of these navigation capabilities in the past ten years through the development of conceptual prototypes and experimental systems in government-sponsored projects.
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