20

100.46

98.93

1.53

0.180

0.859

20

0.470

0.450

0.020

0.410

0.688

20

348.93

332.62

16.31

0.230

0.818

20

8.605

8.116

0.490

0.490

0.631

20

6.42

6.20

0.23

0.330

0.742

20

7.05

6.56

0.49

0.730

0.473

Notes: SD values were computed over days within condition.

10

106.84

146.30

-39.46

-2.280

0.048

10

0.716

0.759

-0.043

-1.020

0.333

10

957.97

824.29

133.68

0.400

0.698

10

11.597

10.564

1.033

0.450

0.667

10

6.32

8.45

-2.13

-1.700

0.124

10

6.61

8.61

-1.99

-1.540

0.157

Notes: SD values were computed over days within condition.

15

374.87

437.67

-62.80

24.65

-2.550

0.023

15

1.388

1.310

0.078

0.099

0.790

0.445

15

736.81

729.98

6.84

74.97

0.090

0.929

15

86.902

84.828

2.074

2.256

0.920

0.374

15

82.132

82.195

-0.064

1.084

-0.060

0.954

15

61.957

61.413

0.544

1.494

0.360

0.721

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

N

Workday Mean

Non-Workday Mean

Difference Mean

Difference SE

t-statistic

Difference p-value

10

313.65

391.72

-78.08

27.15

-2.880

0.018

10

1.944

1.507

0.438

0.177

2.470

0.036

10

2097.61

1404.36

693.26

395.62

1.750

0.114

10

68.467

71.653

-3.186

2.863

-1.110

0.295

10

87.345

82.971

4.374

1.605

2.730

0.023

10

62.638

63.626

-0.988

2.403

-0.410

0.691

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

15

373.77

450.76

-76.99

17.09

-4.510

0.0005

15

1.421

1.373

0.047

0.155

0.310

0.764

15

750.30

774.40

-24.11

95.55

-0.250

0.805

15

86.430

85.290

1.139

1.567

0.730

0.479

15

84.444

82.939

1.504

1.514

0.990

0.337

15

65.860

64.352

1.508

1.610

0.940

0.365

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

N

Workday Mean

Non-Workday Mean

Difference Mean

Difference SE

t-statistic

Difference p-value

10

301.00

451.65

-150.65

27.47

-5.490

0.0004

10

2.242

1.915

0.327

0.162

2.020

0.075

10

2162.99

2033.47

129.51

414.82

0.310

0.762

10

63.998

63.014

0.984

2.737

0.360

0.727

10

86.367

85.184

1.182

2.660

0.440

0.667

10

61.372

67.363

-5.991

3.322

-1.800

0.105

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

15

371.78

375.78

-4.00

9.32

-0.430

0.675

15

1.392

1.406

-0.014

0.036

-0.390

0.706

15

749.91

735.41

14.49

76.17

0.190

0.852

15

86.618

86.536

0.083

1.550

0.050

0.958

15

82.032

84.834

-2.802

2.295

-1.220

0.242

15

62.043

66.198

-4.155

2.414

-1.720

0.107

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

10

313.65

301.00

12.65

18.06

0.700

0.501

10

1.944

2.242

-0.298

0.176

1.690

0.125

10

2097.61

2162.99

-65.37

105.35

0.620

0.550

10

68.467

63.998

4.469

4.573

0.980

0.354

10

87.345

86.367

0.979

2.021

0.480

0.640

10

62.638

61.372

1.266

2.138

0.590

0.568

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

14

438.34

452.56

-14.22

28.41

-0.500

0.625

14

1.310

1.359

-0.049

0.148

-0.330

0.747

14

724.89

748.30

-23.41

121.58

-0.190

0.850

14

84.830

85.758

-0.929

2.894

-0.320

0.753

14

82.145

83.085

-0.940

2.434

-0.390

0.706

14

61.383

64.272

-2.889

3.244

-0.890

0.389

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

10

391.72

451.65

-59.93

28.44

-2.110

0.064

10

1.507

1.915

-0.408

0.158

-2.580

0.030

10

1404.36

2033.48

-629.12

261.98

-2.400

0.040

10

71.653

63.014

8.639

5.366

1.610

0.142

10

82.971

85.184

-2.213

1.925

-1.150

0.280

10

63.626

67.363

-3.737

2.424

-1.540

0.158

Notes: Mean values and difference in mean values are model-predicted least squares estimates.

1

Overall material/content in the course. (n=26; mean response)

4.38

4.23

2

Knowledge gained from course. (n=26; mean response)

4.31

4.23

3

Applicability of course to my lifestyle. (n=26; mean response)

3.88

3.81

4

The lessons learned will help me in my job. (n=26; mean response)

4.46

4.15

5

I used some of the lessons learned during these past 2 weeks. (n=26)

92% yes

88% yes

6

The lessons learned will be put into practice by me in the future. (n=26)

96% yes

96% yes

7

Please write your general comments about the Alertness and Fatigue Management course? The material? It's usefulness to you? Things you might want changed or improved, etc.?

na*

na

1

Overall material/content in the course. (n=12; mean response)

4.50

4.33

2

Knowledge gained from course. (n=12; mean response)

4.67

4.50

3

Applicability of course to my lifestyle. (n=12; mean response)

4.25

3.75

4

The lessons learned will help me in my job. (n=12; mean response)

4.33

4.17

5

I used some of the lessons learned during these past 2 weeks. (n=12)

83% yes

83% yes

6

The lessons learned will be put into practice by me in the future. (n=12)

83% yes

83% yes

7

Please write your general comments about the Alertness and Fatigue Management course? The material? It's usefulness to you? Things you might want changed or improved, etc.?

na*

na

8

Approximately what percentage of the time (24/7) during these past 2 weeks while you participated in the study, did you wear the SleepWatch? (n=26)

≥ 90%

0%

0%

na*

9

If you did not wear the SleepWatch continuously, (i.e. almost 100% of the time) what were some of the circumstances surrounding when you did not wear the SleepWatch? (n=26)

na

na

na

27%

10

Was it bothersome to have the SleepWatch continuously on your wrist? (n=26)

65%

35%

0%

77%

11

The SleepWatch numerical rating mirrored the way I felt. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=26)

3.50

na

0%

na

12

SleepWatch provides useful information for managing a person's sleep schedule. (n=26)

46%

54%

0%

na

13

Did you like the SleepWatch scale of alertness (e.g. 1 to 99)? (n=26)

73%

27%

0%

na

14

Can you suggest a better way to display the SleepWatch information?

na

na

na

31%

15

SleepWatch information provided was helpful supporting my sleep planning/managing alertness during the past two weeks. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=22)

3.27

na

na

na

16

I would like a SleepWatch for myself. (n=25)

38%

58%

4%

62%

17

I would recommend SleepWatch to fellow drivers. (n=26)

50%

50%

0%

31%

18

What suggestions do you have on how to improve the SleepWatch to make it more useful for truck drivers? (n=26)

na

na

na

50%

8

Approximately what percentage of the time (24/7) during these past 2 weeks while you participated in the study, did you wear the SleepWatch? (n=12)

≥ 90%

0%

0%

na*

9

If you did not wear the SleepWatch continuously, (i.e. almost 100% of the time) what were some of the circumstances surrounding when you did not wear the SleepWatch? (n=12)

na

na

na

17%

10

Was it bothersome to have the SleepWatch continuously on your wrist? (n=12)

92%

8%

0%

100%

11

The SleepWatch numerical rating mirrored the way I felt. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

3.50

na

0%

na

12

SleepWatch provides useful information for managing a person's sleep schedule. (n=12)

42%

50%

8%

na

13

Did you like the SleepWatch scale of alertness (e.g. 1 to 99)? (n=12)

83%

17%

0%

na

14

Can you suggest a better way to display the SleepWatch information?

na

na

na

33%

15

SleepWatch information provided was helpful supporting my sleep planning/managing alertness during the past two weeks. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

3.08

na

na

na

16

I would like a SleepWatch for myself. (n=12)

50%

50%

0%

58%

17

I would recommend SleepWatch to fellow drivers. (n=12)

58%

33%

8%

0%

18

What suggestions do you have on how to improve the SleepWatch to make it more useful for truck drivers? (n=12)

na

na

na

50%

19

The SafeTRAC camera position in the windshield distracted me. (n=26)

88%

12%

0%

8%

20

The SafeTRAC system was easy to adjust. (n=26)

58%

27%

15%

46%

21

Use and location of SafeTRAC controls were good. (n=26)

65%

35%

0%

46%

22

Operation of SafeTRAC was consistent and understandable. (n=26)

77%

23%

0%

31%

23

The SafeTRAC numeric display could be read easily. (n=26)

96%

4%

0%

12%

24

SafeTRAC's numeric indicator (1-99) frequently got my attention while driving. (n=26)

73%

27%

0%

42%

25

SafeTRAC's crossing the lane alert feature could be trusted.

5=very helpful, 4=good; 3=neutral; 2=low value; 1=disappointing. (n=25)

3.36

na

na

4%

26

Displayed information provided was reliable; the display usually accurately depicted my driving with regard to tracking the lanes on the road. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=26)

3.50

na

na

4%

27

SafeTRAC warned me of poor lane tracking only when I thought it was appropriate. 5=very helpful, 4=good; 3=neutral; 2=low value; 1=disappointing. (n=26)

2.96

na

na

8%

28

SafeTRAC helped me drive more safely. (n=26)

69%

31%

0%

73%

29

SafeTRAC helped me avoid a potential accident. (n=26)

85%

12%

4%

15%

30

SafeTRAC's alertness index helped me decide when to take rest breaks. (n=26)

46%

54%

0%

42%

31

I would like SafeTRAC installed in my truck. (n=25)

50%

42%

4%

52%

32

I would recommend SafeTRAC to fellow truck drivers. (n=26)

65%

23%

12%

46%

19

The SafeTRAC camera position in the windshield distracted me. (n=12)

0%

100%

0%

25%

20

The SafeTRAC system was easy to adjust. (n=12)

58%

21%

21%

0%

21

Use and location of SafeTRAC controls were good. (n=12)

75%

25%

0%

25%

22

Operation of SafeTRAC was consistent and understandable. (n=12)

58%

42%

0%

50%

23

The SafeTRAC numeric display could be read easily. (n=12)

83%

17%

0%

17%

24

SafeTRAC's numeric indicator (1-99) frequently got my attention while driving. (n=12)

100%

0%

0%

67%

25

SafeTRAC's crossing the lane alert feature could be trusted.

5=very helpful, 4=good; 3=neutral; 2=low value; 1=disappointing. (n=12)

3.25

na

na

0%

12

Displayed information provided was reliable; the display usually accurately depicted my driving with regard to tracking the lanes on the road. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

3.25

na

na

0%

27

SafeTRAC warned me of poor lane tracking only when I thought it was appropriate. 5=very helpful, 4=good; 3=neutral; 2=low value; 1=disappointing. (n=12)

3.25

na

na

0%

28

SafeTRAC helped me drive more safely. (n=12)

42%

58%

0%

67%

29

SafeTRAC helped me avoid a potential accident. (n=12)

0%

100%

0%

0%

30

SafeTRAC's alertness index helped me decide when to take rest breaks. (n=12)

16%

84%

0%

17%

31

I would like SafeTRAC installed in my truck. (n=12)

42%

42%

16%

17%

32

I would recommend SafeTRAC to fellow truck drivers. (n=12)

50%

50%

0%

25%

33

The PERCLOS Eye Camera position on the truck dashboard distracted me. (n=26)

31%

65%

4%

42%

34

The PERCLOS numeric display could be read easily. (n=26)

92%

4%

4%

12%

35

PERCLOS Operation was consistent and understandable. (n=26)

81%

15%

4%

4%

36

The PERCLOS alertness index display was usually a pretty good match to the way I felt: alert or fatigued. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=25)

2.92

na

4%

4%

37

PERCLOS alertness index digital display information was usually accurate/reliable. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=23)

2.91

na

12%

0%

38

Sometimes the display indicated my eyes were drooping, while I felt fully awake/alert. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=24)

3.21

na

8%

0%

39

The PERCLOS alertness index information was helpful to me in monitoring my own level of alertness and/or drowsy periods. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=23)

3.00

na

12%

0%

40

As PERCLOS monitored me for alertness and/or drowsy driving, it made me feel safer. (n=26)

19%

73%

8%

65%

41

I would like to have a PERCLOS Driver Alertness monitor in my truck. (n=26)

27%

69%

4%

50%

42

I would recommend the PERCLOS Driver Alertness monitor to fellow drivers? (n=26)

35%

62%

4%

8%

43

Driver's overall comments and recommendations on the PERCLOS Driver Alertness Monitoring system.

na

na

na

85%

33

The PERCLOS Eye Camera position on the truck dashboard distracted me. (n=12)

50%

50%

0%

67%

34

The PERCLOS numeric display could be read easily. (n=12)

100%

0%

0%

0%

35

PERCLOS Operation was consistent and understandable. (n=12)

83%

17%

0%

25%

36

The PERCLOS alertness index display was usually a pretty good match to the way I felt: alert or fatigued. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

3.33

na

0%

0%

37

PERCLOS alertness index digital display information was usually accurate/reliable. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

3.42

na

0%

0%

38

Sometimes the display indicated my eyes were drooping, while I felt fully awake/alert. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

3.00

na

8%

0%

39

The PERCLOS alertness index information was helpful to me in monitoring my own level of alertness and/or drowsy periods. 5 = very helpful, 4 = good; 3 = neutral; 2 = low value; 1 = disappointing. (n=12)

2.75

na

0%

0%

40

As PERCLOS monitored me for alertness and/or drowsy driving, it made me feel safer. (n=12)

8%

92%

0%

75%

41

I would like to have a PERCLOS Driver Alertness monitor in my truck. (n=12)

0%

100%

0%

50%

42

I would recommend the PERCLOS Driver Alertness monitor to fellow drivers? (n=12)

25%

75%

0%

17%

43

Driver's overall comments and recommendations on the PERCLOS Driver Alertness Monitoring system.

na

na

na

100%

44

Operation of the HPCS was consistent and understandable. (n=26)

88%

8%

4%

42%

45

The use and location of HPCS controls/displays were good. (n=26)

50%

46%

4%

62%

46

The HPCS steering assistance was helpful in my driving. (n=26)

77%

15%

8%

58%

47

HPCS made my driving workload easier. (n=26)

73%

27%

0%

0%

48

I felt comforTable using the HPCS. (n=26)

77%

19%

4%

10%

49

HPCS improved my truck steering or ability to maintain direction. (n=26)

69%

19%

12%

46%

50

HPCS was helpful driving in crosswinds. (n=26)

81%

15%

4%

38%

51

HPCS always worked in a helpful manner. (n=26)

69%

31%

0%

0%

52

How did HPCS affect my driving on curves? Yes = helped; No = hindered. (n=26)

38%

31%

31%

4%

53

Was HPCS helpful driving in straight-aways? Yes = helped; No = hindered. (n=26)

77%

12%

12%

0%

54

HPCS reduces driver fatigue. Yes = helped; No = hindered. (n=26)

54%

31%

15%

54%

55

I would like HPCS in my truck. (n=26)

77%

19%

4%

46%

56

I would recommend HPCS to other drivers. (n=26)

85%

12%

4%

4%

57

Driver's overall comments or recommendations on the HPCS.

na

na

na

85%

44

Operation of the HPCS was consistent and understandable. (n=12)

100%

0%

0%

25%

45

The use and location of HPCS controls/displays were good. (n=12)

83%

17%

0%

50%

46

The HPCS steering assistance was helpful in my driving. (n=12)

83%

17%

0%

75%

47

HPCS made my driving workload easier. (n=12)

75%

25%

0%

0%

48

I felt comforTable using the HPCS. (n=12)

75%

25%

0%

58%

49

HPCS improved my truck steering or ability to maintain direction. (n=12)

83%

17%

0%

58%

50

HPCS was helpful driving in crosswinds. (n=12)

67%

33%

0%

58%

51

HPCS always worked in a helpful manner. (n=12)

75%

17%

8%

0%

52

How did HPCS affect my driving on curves? Yes = helped; No = hindered. (n=12)

17%

58%

25%

8%

53

Was HPCS helpful driving in straight-aways? Yes = helped; No = hindered. (n=12)

100%

0%

0%

0%

54

HPCS reduces driver fatigue. Yes = helped; No = hindered. (n=12)

75%

25%

0%

58%

55

I would like HPCS in my truck. (n=12)

83%

17%

0%

67%

56

I would recommend HPCS to other drivers. (n=12)

83%

17%

0%

0%

57

Driver's overall comments or recommendations on the HPCS.

na

na

na

100%

58

I learned how to master the PVT pretty well, that is, I learned to consistently obtain pretty good reaction time scores? (n=26)

69%

31%

0%

42%

59

Was the PVT testing intrusive to my duty day? (n=26)

58%

27%

15%

50%

60

Did the results of the PVT usually match my perception of my own reaction time? (n=26)

73%

27%

0%

42%

61

When I got slower reaction times on the PVT, it reflected my own overall assessment of my condition (e.g. tired/fatigued)? (n=26)

73%

23%

4%

38%

62

In my opinion the PVT could be used as a personal checking system on driver fitness for duty system (e.g. to check for a driver's readiness to drive as he/she reports for duty, or at rest stops half way through a long trip)? (n=26)

54%

31%

15%

50%

63

Driver's overall comments or recommendations about the PVT reaction time monitoring system? (n=26)

na*

na

na

62%

58

I learned how to master the PVT pretty well, that is, I learned to consistently obtain pretty good reaction time scores? (n=12)

58%

42%

0%

42%

59

Was the PVT testing intrusive to my duty day? (n=12)

58%

42%

0%

58%

60

Did the results of the PVT usually match my perception of my own reaction time? (n=12)

83%

17%

0%

25%

61

When I got slower reaction times on the PVT, it reflected my own overall assessment of my condition (e.g. tired/fatigued)? (n=12)

92%

8%

0%

75%

62

In my opinion the PVT could be used as a personal checking system on driver fitness for duty system (e.g. to check for a driver's readiness to drive as he/she reports for duty, or at rest stops half way through a long trip)? (n=12)

58%

33%

8%

50%

63

Driver's overall comments or recommendations about the PVT reaction time monitoring system? (n=12)

na*

na

na

83%

64

Driver's overall comments/recommendations about the testing, the alertness and fatigue management devices, driver fatigue, etc. (n= 26)

na*

na

na

69%

65

Overall, how useful/effective do you believe the idea of having Driver Alertness and Fatigue Management aids in the truck cab is for assisting you in managing your driving alertness and contributing to safe driving? (1-5 scale; 1=dislike; 2=not helpful; 3=neutral; 4=helpful; 5=very helpful) (n= 23)

3.76

na

12%

52%

66

Do you think other commercial drivers would benefit from fatigue management aids? (n=26)

88%

8%

4%

54%

67

At any time did your fatigue management and alertness monitoring systems shut down while driving during the on-the-road testing? (n=26)

35%

65%

0%

35%

68

Was there enough warning from the alertness monitoring devices' numeric displays to alert you to the fact you were driving while very drowsy and/or that you might be becoming too sleepy to continue driving safely? (n=26)

38%

46%

15%

54%

69

When you received low alertness, or drowsy driving indicators on the digital displays, did they generally seem to accurately match what you were experiencing in terms of drowsiness at the time? (n=26)

54%

35%

12%

42%

72

During the on-the-road testing, was there anything in the fatigue management instrumentation that distracted you from performing your driving duties or interrupted your concentration on your driving tasks?

42%

58%

0%

38%

73

Did you notice anything unsafe about the fatigue management equipment and systems installed in the cab of your truck? (n=26)

27%

73%

0%

27%

74

In design and use of fatigue management systems what needs to be changed?

na

na

na

100%

75

What changes, if any, would you make to the testing procedures we employed with you during this project? (n = 26)

na

na

na

46%

76

What are your opinions regarding ideas of placing driver drowsiness or fatigue monitoring systems into commercial trucks? (n=26)

na

na

na

100%

77

Did the idea of having your performance recorded for several weeks have any effects on your driving behavior, and performance? (n=26)

23%

31%

46%

58%

78

If use of fatigue management aids (like PERCLOS, SafeTRAC, or SleepWatch) or black box monitoring technologies (like our AP+ recorder) were made mandatory, by either government regulations or by trucking industry management, what is your opinion about how they should be used, or might work best? (n=26)

na

na

na

100%

79

Did you have any law enforcement citations for moving violations during the last 2-week period while driving your truck? (n=26)

15%

85%

0%

15%

80

Did you have any law enforcement citations for logbook violations during the last 2-week period while driving your truck? (n=26)

0%

100%

0%

0%

81

Where you involved in an accident or crash during the past 2-week period while driving your truck? (n=26)

7%

93%

0%

7%

82

Did you have any law enforcement citations for an action that occurred in the context of an accident during the last 2-week period while driving your truck? (n=26)

0%

100%

0%

0%

83

Are you willing to participate in a focus group session with other drivers, which would be held when all drivers have completed their participation in this study? (n=26)

92%

8%

0%

0%

64

Driver's overall comments/recommendations about the testing, the alertness and fatigue management devices, driver fatigue, etc. (n= 12)

na*

na

na

100%

65

Overall, how useful/effective do you believe the idea of having Driver Alertness and Fatigue Management aids in the truck cab is for assisting you in managing your driving alertness and contributing to safe driving? (1-5 scale; 1=dislike; 2=not helpful; 3=neutral; 4=helpful; 5=very helpful) (n= 12)

3.75

na

0%

17%

66

Do you think other commercial drivers would benefit from fatigue management aids? (n=12)

100%

0%

0%

33%

67

At any time did your fatigue management and alertness monitoring systems shut down while driving during the on-the-road testing? (n=12)

50%

50%

0%

42%

68

Was there enough warning from the alertness monitoring devices' numeric displays to alert you to the fact you were driving while very drowsy and/or that you might be becoming too sleepy to continue driving safely? (n=12)

58%

42%

0%

50%

69

When you received low alertness, or drowsy driving indicators on the digital displays, did they generally seem to accurately match what you were experiencing in terms of drowsiness at the time? (n=12)

67%

25%

8%

33%

72

During the on-the-road testing, was there anything in the fatigue management instrumentation that distracted you from performing your driving duties or interrupted your concentration on your driving tasks?

58%

42%

0%

58%

73

Did you notice anything unsafe about the fatigue management equipment and systems installed in the cab of your truck? (n=12)

8%

92%

0%

0%

74

In design and use of fatigue management systems what needs to be changed?

na

na

na

67%

75

What changes, if any, would you make to the testing procedures we employed with you during this project? (n = 12)

na

na

na

33%

76

What are your opinions regarding ideas of placing driver drowsiness or fatigue monitoring systems into commercial trucks? (n=12)

na

na

na

75%

77

Did the idea of having your performance recorded for several weeks have any effects on your driving behavior, and performance? (n=12)

42%

58%

0%

67%

78

If use of fatigue management aids (like PERCLOS, SafeTRAC, or SleepWatch) or black box monitoring technologies (like our AP+ recorder) were made mandatory, by either government regulations or by trucking industry management, what is your opinion about how they should be used, or might work best? (n=12)

na

na

na

100%

79

Did you have any law enforcement citations for moving violations during the last 2-week period while driving your truck? (n=12)

8%

92%

0%

8%

80

Did you have any law enforcement citations for logbook violations during the last 2-week period while driving your truck? (n=12)

0%

100%

0%

0%

81

Where you involved in an accident or crash during the past 2-week period while driving your truck? (n=12)

0%

100%

0%

0%

82

Did you have any law enforcement citations for an action that occurred in the context of an accident during the last 2-week period while driving your truck? (n=12)

0%

100%

0%

0%

83

Are you willing to participate in a focus group session with other drivers, which would be held when all drivers have completed their participation in this study? (n=12)

92%

8%

0%

0%

72

During the on-the-road testing, was there anything in the fatigue management instrumentation that distracted you from performing your driving duties or interrupted your concentration on your driving tasks? (n=26)

n = 3

drivers reported PERCLOS

problems

n = 0

(no reports of problems)

n = 1

driver reported

PVT problems

n = 5 drivers reported SafeTRAC

problems

n = 0

(no reports of problems)

73

Did you notice anything unsafe about the fatigue management equipment and systems installed in the cab of your truck? (n=26)

n = 0

(no reports of problems)

n = 0

(no reports of problems)

n = 0

(no reports of problems)

n = 3 drivers reported SafeTRAC

problems

n = 2

drivers reported HPCS

problems

72

During the on-the-road testing, was there anything in the fatigue management instrumentation that distracted you from performing your driving duties or interrupted your concentration on your driving tasks? (n=12)

n = 3

drivers reported PERCLOS

problems

n = 0

(no reports of problems)

n = 0

(no reports of problems)

n = 3 drivers reported SafeTRAC

problems

n = 0

(no reports of problems)

73

Did you notice anything unsafe about the fatigue management equipment and systems installed in the cab of your truck? (n=12)

n = 0

(no reports of problems)

n = 0

(no reports of problems)

n = 0

(no reports of problems)

n = 1 driver reported SafeTRAC

problems

n = 0

(no reports of problems)

70

Which system(s) matched your alertness level best? Rank them with a number 1 as best and 4 as the least helpful in matching your alertness level). And then tell U.S. how you think the most effective ones did this? (n=26)

Mean = 3.05

rank frequency

1 = 0

2 = 6

3 = 4

4 = 7

total = 17

Mean = 2.38

rank frequency

1 = 8

2 = 3

3 = 4

4 = 6

total = 21

Mean = 2.04

rank frequency

1 = 10

2 = 4

3 = 3

4 = 4

total = 21

Mean = 1.90

rank frequency

1 = 10

2 = 6

3 = 2

4 = 3

total = 21

-

71

Which system(s) matched your drowsinesslevel best? Rank them with a number 1 as best and 4 as the least helpful in matching your drowsiness level). And then tell U.S. how you think the most effective ones did this? (n=25)

Mean = 2.84

rank frequency

1 = 1

2 = 4

3 = 4

4 = 4

total = 13

Mean = 2.23

rank frequency

1 = 8

2 = 2

3 = 2

4 = 5

total = 17

Mean = 2.22

rank frequency

1 = 8

2 = 3

3 = 2

4 = 5

total = 18

Mean = 2.00

rank frequency

1 = 8

2 = 6

3 = 2

4 = 3

total = 19

-

Grand average ranking for Q. 70 & 71

2.94

2.30

2.13

1.95

-

70

Which system(s) matched your alertness level best? Rank them with a number 1 as best and 4 as the least helpful in matching your drowsiness level). And then tell U.S. how you think the most effective ones did this? (n=12)

Mean = 3.00

rank frequency

1 = 1

2 = 3

3 = 1

4 = 5

total = 10

Mean = 2.10

rank frequency

1 = 4

2 = 3

3 = 1

4 = 2

total = 10

Mean = 2.70

rank frequency

1 = 4

2 = 0

3 = 1

4 = 5

total = 10

Mean = 2.10

rank frequency

1 = 3

2 = 3

3 = 4

4 = 0

total = 10

-

71

Which system(s) matched your drowsinesslevel best? Rank them with a number 1 as best and 4 as the least helpful in matching your drowsiness level). And then tell U.S. how you think the most effective ones did this? (n=12)

Mean = 3.18

rank frequency

1 = 1

2 = 2

3 = 2

4 = 6

total = 11

Mean = 2.54

rank frequency

1 = 1

2 = 6

3 = 1

4 = 3

total = 11

Mean = 2.36

rank frequency

1 = 5

2 = 0

3 = 3

4 = 3

total = 11

Mean = 1.91

rank frequency

1 = 6

2 = 1

3 = 3

4 = 1

total = 11

-

Grand average ranking for Q. 70 & 71

3.09

2.32

2.53

2.00

-

9.5 - 10

Terrific idea;

Would like to have in truck

1

3

-*

8

8

8.5 - 9.0

1

2

-

4

2

7.5 - 8.0

5

5

-

4

7

6.5 - 7.0

3

3

-

4

1

5.5 - 6.0

2

4

-

0

3

4.5 - 5.0

7

2

-

4

1

3.5 - 4.0

2

3

-

0

1

2.5 - 3.0

1

2

-

0

1

1.5 - 2.0

1

1

-

1

0

0.5 - 1.0

Not good

Don't like it; don't want it

1

0

-

1

1

-

5.79

6.42

-

7.60

7.60

50%

68%

-

77%

84%

9.5 - 10

Terrific idea;

Would like to have in truck

0

1

-*

2

6

8.5 - 9.0

0

3

-

2

2

7.5 - 8.0

1

1

-

4

0

6.5 - 7.0

1

0

-

1

1

5.5 - 6.0

0

0

-

0

1

4.5 - 5.0

1

4

-

2

1

3.5 - 4.0

0

1

-

0

1

2.5 - 3.0

2

1

-

1

0

1.5 - 2.0

3

0

-

0

0

0.5 - 1.0

Not good

Don't like it; don't want it

4

1

-

0

0

2.96

6.08

-

7.46

8.33

9.5 - 10

Terrific idea;

Would like to have in truck

1

4

-*

10

14

8.5 - 9.0

1

5

-

6

4

7.5 - 8.0

6

6

-

8

7

6.5 - 7.0

4

3

-

5

2

5.5 - 6.0

2

4

-

0

4

4.5 - 5.0

8

6

-

6

2

3.5 - 4.0

2

4

-

0

2

2.5 - 3.0

3

3

-

1

1

1.5 - 2.0

4

1

-

1

0

0.5 - 1.0

Not good

Don't like it; don't want it

5

1

-

1

1

4.85

6.31

-

7.55

7.84

39%

59%

-

76%

84%