AN EXPERIMENTAL STUDY ON EFFECTS OF VERBAL COMMUNICATION ON DRIVING
 
Zhang, K., Chinese Academy of Sciences, China
 
In order to examine effects of verbal communication takes on driving and drivers' mental workload, a survey, a field study, and a lab simulation study were carried out. Objective measurements, subjective rating scales, performance of major task and performance of secondary tasks were used for the purpose of this study. It was found that NASA-TLX rating scale was sensitive to driving ask. Time pressure perceived by the subjects under dual-task situation was the main factor that increased mental workload; verbal communication had significant influence on driving; and the spare mental resources were changed significantly as a function of difficulty both in driving and in verbal communication.