Scottish Government

Baseline - 2 ^nd Survey

Baseline - 3 ^rd Survey

Baseline - 4 ^th Survey

Base: All matching between baseline and follow-up surveys
(+3 Very likely - -3 Very unlikely)

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

On being given the scenario in Section 2.1, respondents were asked the perceived likelihood of the following occurring:

Negative Consequences

(i) If I drove down this road at 40 mph, I would cause danger to pedestrians

1.23
1.12

1.76
1.65

t=1.221, df=386
ns

1.19
1.08

1.74
1.61

t=1.121, df=365
ns

1.26
1.08

1.74
1.60

t=1.642, df=284
ns

(ii) If I drove down this road at 40mph I would find it difficult to stop quickly in an emergency

1.22
1.50

1.86
1.68

t=-2.661, df=386
p<0.01

1.17
1.40

1.86
1.59

t=-2.052, df=366
p<0.05

1.20
1.28

1.88
1.64

t=-0.593, df=286
ns

(iii) If I drove down this road at 40mph I would cause an accident

0.52
0.60

1.76
1.73

t=-0.911, df=382
ns

0.57
0.46

1.77
1.68

t=1.120, df=365
ns

0.68
0.36

1.72
1.68

t=3.119, df=285
p<0.01

(iv) If I drove down this road at 40mph I would get caught for speeding

0.44
0.60

1.80
1.87

t=-1.612, df=386
ns

0.43
0.38

1.84
1.85

t=0.411, df=366
ns

0.49
0.45

1.87
1.81

t=0.309, df=286
ns

Positive Consequences

(v) Driving down this road at 40mph would enable me to keep up with the flow of traffic

0.81
0.68

1.66
1.52

t=1.392, df=383
ns

0.86
0.74

1.63
1.51

t=1.193, df=363
ns

0.87
0.79

1.66
1.49

t=0.865, df=283
ns

(vi) If I drove down this road at 40mph I would get to my destination quicker

0.04
-0.06

1.86
1.79

t=1.004, df=385
ns

0.16
-0.01

1.87
1.82

t=1.703, df=365
ns

0.19
-0.17

1.81
1.79

t=2.987, df=286
p<0.01

(vii) Driving down this road at 40mph would feel like a comfortable speed

-0.01
-0.24

1.83
1.80

t=2.540, df=386
p<0.05

0.07
-0.26

1.87
1.74

t=3.253, df=366
p<0.01

-0.04
-0.34

1.89
1.77

t=2.591, df=286
p<0.05

(viii) If I drove down this road at 40mph I would save time

-0.04
-0.10

1.86
1.73

t=0.622, df=386
ns

0.04
-0.05

1.85
1.71

t=1.035, df=366
ns

0.04
-0.37

1.82
1.74

t=3.878, df=285
p<0.001

Baseline - 2 ^nd Survey

Baseline - 3 ^rd Survey

Baseline - 4 ^th Survey

Base: All matching between baseline and follow-up surveys
(+3 Extremely desirable - -3 Extremely undesirable)

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Negative Consequences

(i) Causing danger to pedestrians

-2.77
-2.78

0.73
0.58

t=0.234, df=385
ns

-2.76
-2.68

0.74
0.74

t=-1.574, df=364
ns

-2.74
-2.75

0.77
0.62

t=0.257, df=284
ns

(ii) Finding it difficult to stop quickly in an emergency

-2.23
-2.51

1.59
1.12

t=2.992, df=386 p<0.01

-2.28
-2.38

1.50
1.30

t=1.156, df=365
ns

-2.27
-2.49

1.54
1.11

t=2.242, df=286
p<0.05

(iii) Causing an accident

-2.80
-2.91

0.80
0.36

t=2.593, df=387 p<0.05

-2.82
-2.85

0.73
0.54

t=0.673, df=366
ns

-2.81
-2.87

0.73
0.56

t=1.149, df=286
ns

(iv) Getting caught for speeding

-2.83
-2.86

0.68
0.55

t=0.673, df=385
ns

-2.84
-2.83

0.62
0.56

t=-0.263, df=364
ns

-2.90
-2.86

0.39
0.53

t=-0.981, df=286
ns

Positive Consequences

(v) Being able to keep up with the flow of traffic

0.79
0.62

1.40
1.33

t=2.284, df=385 p<0.05

0.78
0.56

1.44
1.37

t=2.861, df=362
p<0.01

0.78
0.52

1.46
1.42

t=2.880, df=284
p<0.01

(vi) Getting to your destination quicker

0.55
0.50

1.49
1.56

t=0.571, df=386
ns

0.51
0.63

1.51
1.46

t=-1.306, df=365
ns

0.44
0.34

1.51
1.69

t=0.942, df=284
ns

(vii) Driving at what you feel is a comfortable speed

1.79
1.68

1.33
1.28

t=1.398, df=385
ns

1.78
1.68

1.34
1.30

t=1.103, df=363
ns

1.78
1.75

1.35
1.36

t=0.304, df=284
ns

(viii) Saving time

0.26
0.26

1.50
1.46

t=0.00, df=385
ns

0.21
0.23

1.54
1.48

t=-0.155, df=364
ns

0.21
0.13

1.55
1.54

t=0.777, df=284
ns

Baseline - 2 ^nd Survey

Baseline - 3 ^rd Survey

Baseline - 4 ^th Survey

Base: All matching between baseline and follow-up surveys
Attitude i = instrumental belief i x outcome evaluation i

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Mean

Std Devn

Paired Differences

Negative Consequences

(i) Causing danger to pedestrians

-3.52
-3.22

5.17
4.81

t=-1.106, df=385
ns

-3.40
-3.00

5.12
4.68

t=-1.400, df=364
ns

-3.61
-3.08

5.07
4.66

t=-1.632, df=283
ns

(ii) Finding it difficult to stop quickly in an emergency

-2.68
-3.71

5.55
5.04

t=3.236, df=385
p<0.01

-2.69
-3.41

5.47
4.82

t=2.283, df=365
p<0.05

-2.72
-3.39

5.63
4.72

t=1.783, df=286
ns

(iii) Causing an accident

-1.31
-1.74

5.16
5.14

t=1.587, df=382
ns

-1.48
-1.32

5.20
4.93

t=-0.568, df=365
ns

-1.84
-1.11

5.06
4.98

t=-2.385, df=285
p<0.05

(iv) Getting caught for speeding

-1.26
-1.67

5.29
5.45

t=1.372, df=384
ns

-1.19
-1.16

5.42
5.38

t=-0.079, df=364
ns

-1.47
-1.38

5.49
5.30

t=-0.246, df=286
ns

Positive Consequences

(v) Being able to keep up with the flow of traffic

1.15
1.14

3.28
2.63

t=0.043, df=383
ns

1.30
0.89

3.41
2.78

t=2.175, df=361
p<0.05

1.19
1.13

3.42
2.58

t=0.255, df=283
ns

(vi) Getting to your destination quicker

0.50
0.61

3.26
3.04

t=-0.560, df=384
ns

0.67
0.34

3.31
3.21

t=1.588, df=364
ns

0.62
0.65

3.18
3.34

t=-0.107, df=284
ns

(vii) Driving at what you feel is a comfortable speed

-0.05
-0.65

4.33
4.26

t=2.535, df=384
p<0.05

0.18
-0.52

4.40
4.05

t=2.765, df=363
p<0.01

0.02
-0.65

4.39
4.44

t=2.118, df=284
p<0.05

(viii) Saving time

0.88
0.82

3.14
2.96

t=0.306, df=384
ns

1.08
0.45

3.20
2.92

t=3.272, df=364
p<0.01

0.99
0.76

3.14
3.00

t=0.923, df=283
ns

Composite Attitude to the Behaviour

-6.25
-8.21

18.92
19.33

t=2.050, df=373 p<0.05

-5.57
-7.69

19.62
18.86

t=2.156, df=353 p<0.05

-6.73
-6.82

19.62
18.02

t=0.071, df=277
ns