Dual Task Method to Estimate Task Demand Caused by Operating In-Vehicle Systems -Discussion on Lane Change Test ‐.

The dual task method is one of techniques to assess demands on drivers caused by in-vehicle information control tasks. The Lane Change Test, discussed in ISO/TC22/SC13/WG8, is a kind of dual task method. This paper describes appropriate procedures for conducting dual task methods by investigating the sensitivities of LCT on differences among task demands. Results showed LCT performances, an indicator of demands, were influenced by drivers' experiences of both LCT and in-vehicle tasks and they were not correlated to the drivers' behavior in actual driving. Based on the results, this paper discusses how important it is to select participants in LCT carefully and grasp trade-off relationships among two task performances according to the drivers' information processing. [ABSTRACT FROM AUTHOR]