Table 2. Descriptive statistics of attitudinal questions (M, SD, 1 = strongly disagree, 2 = disagree, 3 = neutral, 4 = agree, 5 = strongly agree, n = number of respondents).
Means were ordered from highest to lowest in order to show high, moderate, and low mean ratings.
| Question | M | SD | Relative frequencies of response categories | n | |||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | ||||
| Q26. Please indicate how often you use your automated car with speed and steering support. * [60, 61] | 4.70 | 1.44 | 3% | 7% | 12% | 16% | 20% | 42% | 698 |
| Q35. I always know when my car is in partly automated driving mode. [62] | 4.42 | 0.87 | 1% | 4% | 5% | 30% | 59% | – | 645 |
| Q31. I trust my partly automated car to maintain speed and distance to the car ahead. [63] | 4.41 | 0.85 | 1% | 4% | 7% | 31% | 58% | – | 641 |
| Q46. I use my partly automated car because it helps me to reach my destination more comfortably. [38, 51] | 4.38 | 0.90 | 2% | 3% | 7% | 30% | 57% | – | 614 |
| Q42. I monitor the performance of my partly automated car most of the time. ** | 4.34 | 0.87 | 2% | 3% | 7% | 35% | 53% | – | 644 |
| Q55. I feel safe most of the time. [38, 64, 65] | 4.22 | 0.75 | 1% | 2% | 11% | 49% | 38% | – | 613 |
| Q45. I use my partly automated car because it helps me to reach my destination more safely. [38, 51] | 4.17 | 0.93 | 2% | 4% | 13% | 37% | 44% | – | 615 |
| Q38. My partly automated car always reminds me to keep my hands on the steering wheel. ** | 4.15 | 1.17 | 7% | 5% | 8% | 27% | 53% | – | 627 |
| Q47. I use my partly automated car because it makes driving more pleasurable. ** | 4.09 | 1.08 | 3% | 7% | 12% | 32% | 46% | – | 612 |
| Q56. I feel relaxed most of the time. [38, 51] | 4.07 | 0.85 | 1% | 5% | 13% | 50% | 32% | – | 612 |
| Q39. My partly automated car helps me to keep using it in the manner as advised by the manual. ** | 4.02 | 0.94 | 2% | 5% | 18% | 40% | 35% | – | 630 |
| Q40. I can trust my partly automated car. [29, 65] | 3.97 | 0.97 | 2% | 8% | 13% | 45% | 32% | – | 647 |
| Q37. My partly automated car always reminds me to take back full control. ** | 3.92 | 1.20 | 6% | 8% | 17% | 27% | 42% | – | 620 |
| Q32. I trust my partly automated car to keep the car centered in the lane. [62] | 3.89 | 1.13 | 4% | 10% | 14% | 36% | 36% | – | 622 |
| Q60. I entrust the safety of a close relative to my partly automated car. [66] | 3.86 | 1.06 | 3% | 10% | 17% | 39% | 31% | – | 590 |
| Q22.3. Please indicate how often you activate Adaptive Cruise Control in your car. *** [60, 61] | 3.83 | 1.06 | 6% | 6% | 15% | 47% | 27% | – | 719 |
| Q36. The surrounding elements (other road users, road borders, marks) detected by my partly automated car are always clear to me. ** | 3.80 | 1.04 | 2% | 13% | 16% | 42% | 28% | – | 642 |
| Q22.1. Please indicate how often you activate Lane Departure Warning in your car. *** [60, 61] | 3.72 | 1.46 | 13% | 11% | 14% | 16% | 46% | – | 719 |
| Q22.2. Please indicate how often you activate Lane Keeping Assist in your car. *** [60, 61] | 3.60 | 1.38 | 13% | 10% | 16% | 26% | 35% | – | 719 |
| Q41. I am unwilling to hand over control to my partly automated car from time to time. ** | 2.86 | 1.35 | 22% | 23% | 14% | 30% | 11% | – | 635 |
| Q59. I am concerned about my general safety most of the time. [38] | 2.39 | 1.21 | 25% | 39% | 15% | 14% | 7% | – | 613 |
| Q33. I feel hesitant about activating the partly automated car mode from time to time. [65, 67] | 2.38 | 1.32 | 33% | 29% | 11% | 19% | 8% | – | 645 |
| Q34. I engage in other activities while driving my partly automated car. [38, 64, 65] | 2.27 | 1.21 | 34% | 31% | 14% | 18% | 4% | – | 643 |
| Q58. I feel bored most of the time. [52] | 2.26 | 0.93 | 19% | 48% | 22% | 9% | 2% | – | 609 |
| Q48. I use my partly automated car because it helps me to use my time for other activities unrelated to driving. [38, 51] | 2.17 | 1.15 | 35% | 34% | 15% | 11% | 4% | – | 612 |
| Q57. I feel anxious most of the time. [52] | 1.94 | 0.93 | 36% | 44% | 13% | 6% | 2% | – | 609 |
Notes:
* Q26 was measured on a scale from 1 = Never, 2 = Less than monthly, 3 = Less than weekly but more than once a month, 4 = 1–2 times a week, 5 = 3–4 times a week, to 6 = At least 5 times a week.
** Self-created.
** Q22.3 was measured on a scale from 1 = Never, 2 = Rarely, 3 = Occasionally, 4 = Frequently, to 5 = Always.