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Publication Number: FHWA-HRT-09-039
Date: April 2010

Pavement Marking Demonstration Project: State of Alaska and State of Tennessee-Report to Congress

Appendix A. Crash Surrogate Study Results

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Table 27 provides a coded study site matrix to be used a key for subsequent tables.

Table 27. Coded study site matrix.

Speed Limit (mi/h)

Curve Radius

Radius ≤ 700 ft

(Degree of Curvature ≥ ~8.0)

Radius ≥ 800 ft

(Degree of Curvature ≤ ~7.0)

Presence of Paved Shoulder

Presence of Paved Shoulder

Yes

No

Yes

No

Greater than or equal to 55

1

2

3

4

Less than or equal to 50

5

6

7

8

Table 28 provides the sample size for the crash surrogate study. Table 29 through table 32 provide the speed data by location, change in speed data by location, lateral position data by location, and change in lateral position data by location, respectively, for the study.

Table 28. Sample size of crash surrogate study.

Curve Code Comparison (C)/ Treatment (T) Speed (mi/h) Radius (ft) Shoulder (Y/N) Time of Day Observations
Limit Advisory Before After

1

1

T

55

30

318

N

Day

849

752

Night

86

82

2

1

T

55

35

539

N

Day

388

613

Night

44

84

3

1

C

55

35

649

N

Day

804

828

Night

75

83

4

1

C

55

40

663

N

Day

492

674

Night

66

135

5

2

T

55

30

314

Y

Day

298

810

Night

76

100

6

2

C

55

35

613

Y

Day

2,770

1,031

Night

199

274

7

3

T

55

30

881

N

Day

871

916

Night

83

56

8

3

C

55

40

1,857

N

Day

408

770

Night

43

99

9

4

T

55

N

1,171

Y

Day

904

735

Night

84

86

10

4

T

55

45

1,250

Y

Day

890

1,050

Night

60

97

11

4

C

55

N

1,425

Y

Day

923

790

Night

83

94

12

5

T

35

30

406

N

Day

891

914

Night

72

98

13

5

T

50

40

672

N

Day

1,340

1,224

Night

117

102

14

5

C

45

30

460

N

Day

1,291

686

Night

95

193

15

5

C

35

30

511

N

Day

1,801

1,403

Night

116

261

16

7

T

50

40

1,193

N

Day

279

1,083

Night

113

104

17

7

C

45

30

860

N

Day

626

846

Night

354

211

18

8

T

45

N

1,161

Y

Day

2,065

772

Night

247

143

19

8

C

35

N

1,650

Y

Day

1,337

1,222

Night

129

169

Table 29. Speed data by location.

Curve

Code

Statistic

Speed by Location (ft/s)

U

W

PC

MC

Before

After

Before

After

Before

After

Before

After

1

1

Mean

71.6

71.5

71.9

75.4

67.4

67.6

60.2

60.1

SD

8.4

8.8

12.5

9.6

7.7

7.7

5.9

6.5

2

1*

Mean

69.7

69.8

69.9

   

69.1

62.8

64.5

SD

10.1

9.4

8.6

   

7.9

8.7

8.8

3

2

Mean

73.7

73.8

70.8

70.9

66.4

65.9

55.9

56.3

SD

8.1

8.2

8.1

8.2

7.6

7.4

6.0

5.8

4

2

Mean

73.1

72.1

78.8

77.1

78.3

76.1

74.9

73.7

SD

7.7

9.2

8.7

9.1

8.5

8.8

8.0

8.5

5

2*

Mean

75.0

73.3

73.3

 

68.0

 

65.0

65.7

SD

10.6

10.7

9.9

 

9.8

 

8.5

8.6

6

2*

Mean

75.4

74.2

76.5

76.4

75.2

75.7

72.8

72.8

SD

12.5

12.5

9.5

9.7

9.2

9.3

9.2

8.9

7

3

Mean

84.4

83.5

83.5

83.2

82.7

82.3

81.0

81.7

SD

7.2

7.2

7.3

7.2

7.5

7.4

7.7

7.4

8

3

Mean

75.9

74.3

 

82.1

82.0

81.5

80.7

80.6

SD

17.9

17.7

 

9.9

9.6

9.1

9.3

9.0

9

3*

Mean

88.2

87.0

86.6

86.7

84.6

84.4

84.9

84.7

SD

7.6

7.6

7.6

7.8

7.8

8.0

7.5

7.4

10

4

Mean

69.1

69.2

69.2

68.8

68.9

68.5

68.1

68.0

SD

7.5

7.4

8.2

8.4

8.2

8.4

8.4

8.7

11

4*

Mean

77.8

76.1

83.1

81.7

80.4

80.6

82.3

 

SD

11.3

12.7

9.8

10.6

9.2

9.8

8.8

 

12

6

Mean

62.4

 

64.5

64.8

61.4

54.7

55.0

54.2

SD

9.3

 

8.0

9.1

7.4

6.8

5.9

6.1

13

6

Mean

75.3

74.9

77.8

77.9

74.3

76.0

72.7

72.6

SD

12.0

14.0

9.5

9.3

9.0

10.1

9.1

8.8

14

6*

Mean

75.4

76.1

72.3

76.2

71.3

73.2

64.3

65.7

SD

8.7

8.9

7.8

7.9

6.6

6.8

6.3

6.4

15

6*

Mean

73.1

72.5

69.9

69.4

 

63.5

60.5

59.4

SD

8.6

9.1

8.3

8.6

v

8.3

7.7

8.5

16

7

Mean

79.3

77.0

80.1

77.9

80.2

78.0

73.8

72.3

SD

8.6

8.7

9.0

8.7

9.0

8.6

8.5

8.1

17

7*

Mean

60.6

60.8

72.3

71.3

70.3

70.2

68.3

 

SD

20.4

20.0

9.7

8.9

9.3

9.2

8.7

 

18

8

Mean

73.1

77.1

78.5

79.6

76.0

76.7

74.6

75.6

SD

8.8

8.9

9.7

8.8

9.5

8.7

9.2

8.1

19

8*

Mean

74.7

74.8

76.4

75.9

72.3

71.9

70.7

70.4

SD

7.2

7.7

7.9

7.8

7.0

6.9

6.8

6.7

* Indicates a comparison study site.

Note: Blank cells indicate missing data.

Table 30. Change in speed data by location.

Curve Code Statistic Change in Speed by Location (ft/s)
W-U PC-W MC-PC
Before After Before After Before After
1 1 Mean -1.1 3.9 -4.9 -7.8 -7.2 -7.6
SD 9.2 5.9 12.0 5.8 4.5 4.9
2 1* Mean .2         -4.6
SD 6.7         5.0
3 2 Mean -2.9 -2.9 -4.4 -5.0 -10.5 -9.6
SD 4.1 4.3 2.1 2.3 4.4 4.8
4 2 Mean 5.7 5.0 -.5 -1.0 -3.4 -2.5
SD 3.1 5.3 2.0 2.1 2.6 2.5
5 2* Mean -1.7   -5.3   -2.9  
SD 7.3   5.2   6.4  
6 2* Mean 1.1 2.3 -1.2 -.7 -2.5 -2.9
SD 7.9 15.8 3.5 13.2 3.3 12.0
7 3 Mean -.9 -.3 -.8 -.9 -1.6 -.5
SD 2.8 3.1 2.5 2.7 2.3 2.1
8 3 Mean   8.0   -.8 -1.0 -.9
SD   13.1   3.4 2.9 2.3
9 3* Mean -1.6 -.3 -2.0 -2.3 .2 .2
SD 3.2 3.7 3.1 3.7 2.2 3.0
10 4 Mean .1 -.4 -.4 -.3 -.8 -.5
SD 5.3 4.9 2.3 2.1 3.2 2.2
11 4* Mean 5.4 5.6 -2.7 -1.1 1.9  
SD 7.3 8.0 3.9 3.7 3.5  
12 6 Mean 2.1   -3.1 -10.0 -6.4 -.5
SD 10.6   3.2 8.0 8.7 3.3
13 6 Mean 2.5 3.1 -3.6 -3.7 -1.5 -.8
SD 7.7 10.2 2.8 2.5 1.8 1.7
14 6* Mean -3.2 .1 -.9 -2.9 -7.0 -7.5
SD 6.5 5.5 3.5 3.0 4.4 4.5
15 6* Mean -3.3 -3.0   -5.9   -4.0
SD 4.1 8.4   9.6   8.5
16 7 Mean .8 .9 .1 .1 -6.4 -5.9
SD 4.9 4.9 2.8 2.6 4.3 3.6
17 7* Mean 11.8 10.5 -2.0 -1.2 -2.1  
SD 18.3 17.5 3.5 3.6 3.2  
18 8 Mean 4.3 2.6 -2.7 -3.0 -1.3 -1.2
SD 4.8 4.6 3.7 3.6 3.9 3.1
19 8* Mean 1.6 1.1 -4.1 -4.1 -1.6 -1.5
SD 3.6 4.6 4.1 3.8 2.1 2.2

* Indicates a comparison study site.

Note: Blank cells indicate missing data.

Table 31. Lateral position data by location.

Curve Code Statistic Lateral Position by Location (inches)
U W PC MC
Before After Before After Before After Before After
1 1 Mean 42.2 40.4 34.5 32.5 22.1 30.1 46.2 50.2
SD 13.5 13.9 16.5 9.5 10.9 9.2 17.4 15.5
2 1* Mean 27.7 27.4 24.7     26.5 47.6 48.3
SD 10.3 11.1 9.5     12.0 13.8 14.1
3 2 Mean 35.8 43.4 28.1 26.1 22.3 21.7 36.2 39.1
SD 13.6 11.5 10.1 9.2 10.5 9.1 14.5 13.4
4 2 Mean 23.7   25.1 27.6 30.9 32.9 40.5 44.2
SD 12.3   11.4 11.3 10.9 11.8 14.9 15.7
5 2* Mean 40.7 38.8 30.2   30.7   53.7 55.2
SD 11.3 11.7 9.8   11.7   16.0 15.6
6 2* Mean 33.4   27.5 25.4 17.1 20.5 34.0 34.3
SD 13.2   11.6 10.9 10.9 12.0 15.0 15.3
7 3 Mean 31.1 31.0 39.6 35.9 37.3 38.9 43.6 43.0
SD 13.3 13.6 11.4 11.6 13.0 13.9 13.9 14.2
8 3 Mean 30.7 30.1   40.6 46.7 41.5 56.2 54.6
SD 13.5 13.0   11.0 14.6 13.6 15.5 16.2
9 3* Mean 43.3 41.1 42.9   37.5 34.6 49.2 45.2
SD 10.8 10.9 11.4   11.8 13.2 13.7 14.2
10 4 Mean 31.6 30.5 28.9   28.1 25.8 29.3 28.9
SD 12.0 13.1 11.1   10.7 12.3 13.3 12.9
11 4* Mean 37.9 36.4 33.9 30.2 26.5 32.9 34.1  
SD 13.8 15.2 10.8 11.9 11.2 12.2 12.0  
12 6 Mean 37.5   39.3 35.2 18.0 26.0 43.5 51.7
SD 11.2   11.1 11.7 5.2 11.1 16.5 16.3
13 6 Mean 34.8 41.6 32.0 30.0 30.8 30.6 40.3 37.7
SD 12.7 15.2 10.8 11.4 11.9 11.8 12.8 13.1
14 6* Mean 29.7 29.6 44.1 37.5 39.1 38.0 53.8 52.4
SD 9.0 8.9 10.5 10.9 10.3 10.8 16.0 17.2
15 6* Mean 32.0 6.6 45.1 23.5   41.6 38.6 43.2
SD 12.1 11.6 14.9 13.2   12.3 13.1 15.6
16 7 Mean 38.0 37.5 31.2 34.1 23.7 23.0 38.8 38.8
SD 13.2 12.7 12.7 11.9 11.1 10.9 12.6 13.8
17 7* Mean 40.6 39.0 23.6 24.7 28.9 30.2 34.6  
SD 16.9 16.0 10.5 10.1 12.2 10.7 16.8  
18 8 Mean 57.7 33.9 30.7 29.7 24.8 22.3 38.1 36.6
SD 22.5 11.3 11.7 9.7 11.1 9.7 13.1 12.0
19 8* Mean 31.8 39.4 38.7 38.3 32.1 34.1 51.6 53.9
SD 11.4 10.0 10.2 11.1 10.8 10.3 13.6 14.8

* Indicates a comparison study site.

Note: Blank cells indicate missing data.

Table 32. Change in lateral position data by location.

Curve Code Statistic Change in Lateral Position by Location (inches)
W-U PC-W MC-PC
Before After Before After Before After
1 1 Mean   -5.8   -7.9   -10.2   -2.4   24.2   20.1
SD   20.4   14.5   16.8   10.9   17.5   15.6
2 1* Mean   -3.0           21.9
SD   11.7           15.1
3 2 Mean   -7.7   -17.3   -5.8   -4.4   13.9   17.3
SD   14.1   12.1   6.8   6.3   14.4   13.5
4 2 Mean   1.4     5.9   5.3   9.6   11.3
SD   12.7     10.7   11.2   13.3   14.4
5 2* Mean   -10.5     .5     23.1  
SD   12.6     10.9     15.7  
6 2* Mean   -5.9     -10.4   -5.0   16.9   13.8
SD   14.4     12.8   15.6   13.2   18.6
7 3 Mean   8.5   4.9   -2.3   3.0   6.3   4.0
SD   14.1   13.6   12.8   13.6   13.3   14.1
8 3 Mean     10.4     1.0   9.4   13.2
SD     14.1     12.5   17.3   16.7
9 3* Mean   -.3     -5.5     11.7   10.5
SD   11.5     11.8     13.2   14.8
10 4 Mean   -2.7     -.8     1.2   3.2
SD   15.0     8.9     12.4   12.3
11 4* Mean   -4.0   -6.2   -7.4   2.7   7.6  
SD   14.5   16.0   11.1   11.7   12.3  
12 6 Mean   1.8     -21.3   -9.2   25.5   25.8
SD   14.6     9.8   13.3   17.5   16.1
13 6 Mean   -2.9   -11.5   -1.2   -2.0   9.5   11.2
SD   13.6   16.8   10.5   9.5   10.8   11.6
14 6* Mean   14.3   7.9   -5.0   .6   14.7   14.5
SD   11.9   11.3   12.4   12.3   15.8   16.4
15 6* Mean   13.0   17.4     18.1     1.6
SD   15.9   15.3     16.3     17.8
16 7 Mean   -6.7   -3.5   -7.6   -11.1   15.1   15.8
SD   15.5   14.6   11.8   12.2   14.0   14.1
17 7* Mean   -17.0   -14.4   5.3   5.5   5.8  
SD   17.3   15.3   12.2   9.7   16.0  
18 8 Mean   -27.5   -4.2   -6.0   -7.4   13.4   14.3
SD   21.5   11.7   12.0   10.1   13.4   12.8
19 8* Mean   6.8   -1.1   -6.6   -4.3   19.6   19.9
SD   15.1   10.8   14.9   11.1   13.0   13.9

* Indicates a comparison study site.

Note: Blank cells indicate missing data.

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