Vehicle control and drowsiness - VTI

When studying the variations of the different individuals it is obvious that twotest-subjects in the group that are suffering from drowsiness are veering off theroad a lot more frequently than the others. The data from those two subjects whereremoved to see how much they influenced the result. After the data from subjectnumber two and 17 were removed the same study was done. Then it was not asobvious that it was a difference between the two groups, see figure 34.Figure 34 The graph shows the mean value of how many times a person is twoseconds from crossing the line in each group. In the tired group, data from twosubjects (2 and 17) has been removed. Both subjects are from the group thatsuffer from drowsiness.64 VTI meddelande 922A