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
|
55
|
1
|
2
|
3
|
4
|
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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