Vehicle control and drowsiness - VTI

More documents

Recommendations

Info

Example 1: subject number 2An initial analysis of the individual subjects driving behaviour may reveal somepossible indicators of connections between drowsiness and driving behaviour. Arelationship between drowsiness and lateral position can be detected on subjects’number two and 17 (both from the tired group). Subjects number two and 17 areexamples of drivers that have changes in lateral position through time. Thesesubjects have also higher amplitudes in the lateral position than others (higherSDLP). They are close to or are veering off more often than others.Figure 17 Lateral position, SDLP and estimated drowsiness for subjectnumber 2. The lateral position is measured with 10 Hz. The SDLP window is setto 30 seconds. The drowsiness was estimated every five minutes.For subject number two the estimated drowsiness is low when the subject startsdriving. When the driver gets tired, after 600 seconds, the SDLP starts to increase.From 600 seconds forwards, the SDLP increases and the SDLP and estimateddrowsiness is high during a long period. After each time the driver have veeredoff, the driver seems to wake up for a few seconds before the SDLP increasesagain. After 5000 seconds the estimated drowsiness starts to decrease. The SDLPis also decreasing at the same time.48 VTI meddelande 922A
Example 2, subject number 17Figure 18 Lateral position, SDLP and estimated drowsiness for subjectnumber 17. The lateral position is measured with 10 Hz. The SDLP window is setto 30 seconds. The drowsiness was estimated every five minutes.Subject number 17 has the highest SDLP values and amplitude in lateral positionof all. The SDLP for subject number 17 increases through the whole 2-hourperiod. The estimated drowsiness also seems to increase to some extent throughthe two hours. Note that subject number 17 does not use the whole KSS whenestimating his drowsiness even if the driver seems to be very tired (looking at theSDLP).VTI meddelande 922A 49
Page 1 and 2: VTI meddelande 922A • 2002Vehicle
Page 3 and 4: Publisher:Publication:VTI Meddeland
Page 5 and 6: ForewordThis study was commissioned
Page 7 and 8: ContentPageSummary 7Sammanfattning
Page 9 and 10: Vehicle Control and Drowsinessby Al
Page 11 and 12: Part one: Literature Study1 Introdu
Page 13 and 14: 1.3 ValidationA relevant problem in
Page 15 and 16: 2 Terms and definitions“Fatigue:
Page 17 and 18: 4 Methods to identify drowsiness in
Page 19 and 20: ight light conditions, when people
Page 21 and 22: Micro-correction in steeringMicro-c
Page 23 and 24: in response to conditions in the ro
Page 25 and 26: driving performance measures. Some
Page 27 and 28: SD lateral positionFigure 10 Standa
Page 29 and 30: Different measures have been used i
Page 31 and 32: Figure 12 Prediction results for 50
Page 33 and 34: 1: AVEOBS, which is an observer rat
Page 35 and 36: 5 Commercially available fatigue mo
Page 37 and 38: 5.5 Companies that are planning to
Page 39 and 40: 7 Problems related to automatic dro
Page 41 and 42: 8 Further literature of interestThe
Page 43 and 44: 9.3 Other physiological measuresPhy
Page 45 and 46: Note: the summary only illustrates
Page 47: Figure 16 Lateral position of a dri
Page 51 and 52: 11 Analysis of drowsiness ratingIn
Page 53 and 54: 0,60,5SDLP (meters)0,40,30,2TiredAl
Page 55 and 56: As described in the previous sectio
Page 57 and 58: 109Tiredness876Predicted YTiredAler
Page 59 and 60: 14 Times driver change directionA s
Page 61 and 62: A large number of previous studies
Page 63 and 64: The two groups where compared in or
Page 65 and 66: 16 Frequency AnalysisAn analysis of
Page 67 and 68: The large power variation between i
Page 69 and 70: Fourier transform on the two groups
Page 71 and 72: 16.2 Power Spectrum estimate via Bu
Page 73 and 74: Table 9 Average value of dependent
Page 75 and 76: 18.4 Time to Line Crossing - TLCIn
Page 77 and 78: 19 References1. Wierwille, WW & Wre
Page 79 and 80: 29. PERCLOS: A Valid Psychophysiolo
Page 81 and 82: 54. Chiu-Geng, Lin: Lane Sensing an
Page 83 and 84: 87. Haworth, NL & Vulcan, AP: Testi
Page 85 and 86: Appendix 1Page 1 (2)TLC formulaeVTI
Page 87 and 88: TLC calculationAppendix 2Page 1 (1)
Page 89 and 90: Appendix 4Page 1 (2)Definition of t

Vehicle control and drowsiness - VTI

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?