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Publication Number:  FHWA-HRT-17-082    Date:  December 2017
Publication Number: FHWA-HRT-17-082
Date: December 2017

 

Safety Evaluation of Signalized Restricted Crossing U-Turn Intersections

Appendix. Analysis of Other Crash Variables

Table 17 through table 27 provide more information on the crash variables from the RCUT test sites.

Table 17. Other crash variables at Alabama-Plum site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period P percent of Total Crashes

Right front angle crash

9

5.4

3

7.5

Left front angle crash

1

0.6

1

2.5

Head-on center crash

9

5.4

5

12.5

Undercarriage crash

1

0.6

0

0.0

Broadside right crash

5

3.0

1

2.5

Right rear angle crash

115

68.5

1

2.5

Rear-end center crash

5

3.0

21

52.5

Left rear angle crash

1

0.6

0

0.0

Broadside left crash

1

0.6

0

0.0

No second vehicle crash

10

6.0

1

2.5

No applicable crash type

10

6.0

7

17.5

Missing crash type

1

0.6

0

0.0

Daylight

125

74.4

24

60.0

Dark

39

23.2

13

32.5

Dusk

4

2.4

2

5.0

Dawn

0

0.0

1

2.5

Clear weather

93

55.4

27

67.5

Cloudy weather

40

23.8

10

25.0

Foggy weather

1

0.6

0

0.0

Rainy weather

34

20.2

3

7.5

Dry road condition

118

70.2

33

82.5

Wet road condition

50

29.8

4

10.0

Unknown road condition

0

0.0

2

5.0

Water buildup on road

0

0.0

1

2.5

Table 18. Other crash variables at Alabama-Retail site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Right front angle crash

1

2.3

0

0.0

Left front angle crash

0

0.0

1

33.3

Head-on center crash

4

9.1

0

0.0

Undercarriage crash

2

4.6

0

0.0

Broadside right crash

0

0.0

0

0.0

Right rear angle crash

26

59.1

0

0.0

Rear-end center crash

1

2.3

2

66.7

Left rear angle crash

1

2.3

0

0.0

Broadside left crash

1

2.3

0

0.0

No second vehicle crash

0

0.0

0

0.0

No applicable crash type

6

13.6

0

0.0

Missing crash type

2

4.6

0

0.0

Daylight

34

77.3

2

66.7

Dusk

3

6.8

0

0.0

Dark, roadway lighted

1

2.3

0

0.0

Dark, roadway not lighted

6

13.6

1

33.3

Clear weather

27

74.4

2

66.7

Cloudy weather

7

2.4

0

0.0

Foggy weather

0

5.4

0

0.0

Rainy weather

10

17.9

1

33.3

Dry road condition

33

75.0

2

66.7

Wet road condition

11

25.0

1

33.3

Table 19. Other crash variables at North Carolina site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle crash

4

2.0

2

1.3

Animal crash

1

0.5

4

2.5

Backing-up crash

1

0.5

1

0.6

Fixed object crash

2

1.0

4

2.5

Left-turn, different roadways crash

4

2.0

5

3.1

Left-turn, same roadway crash

58

29.0

17

10.7

Movable object crash

1

0.5

2

1.3

Parked crash

0

0.0

1

0.6

Other crash with vehicle

1

0.5

0

0.0

Pedalcyclist crash

1

0.5

0

0.0

Ran off road, right crash

1

0.5

0

0.0

Rear-end crash

102

51.0

82

51.6

Right-turn, different roadways crash

12

6.0

22

13.8

Right-turn, same roadway crash

1

0.5

2

1.3

Sideswipe, opposite direction crash

1

0.5

1

0.6

Sideswipe, same direction crash

10

5.0

16

10.1

Daylight

139

69.5

112

70.4

Dawn

18

9.0

16

10.1

Dusk

43

21.5

31

19.5

Clear weather

194

97.0

156

98.1

Foggy weather

3

1.5

2

1.3

Rainy weather

3

1.5

1

0.6

Dry road condition

165

82.5

129

81.1

Wet road condition

34

17.0

30

18.9

Icy road condition

1

0.5

0

0.00

Table 20. Other crash variables at Ohio-Symmes site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle crash

10

13.3

7

10.0

Backing-up crash

1

1.3

1

1.4

Fixed object crash

0

0.0

7

10.0

Head-on crash

1

0.9

1

1.4

Left-turn crash

19

16.8

6

8.6

Parked vehicle crash

1

0.9

0

0.0

Other noncrash

0

0.0

2

2.9

Pedestrian crash

0

0.0

1

1.4

Rear-end crash

75

66.4

41

58.6

Sideswipe, meeting crash

2

1.8

0

0.0

Sideswipe, passing crash

4

3.5

4

5.7

Dark, lighted

26

23.0

11

15.7

Dark, no light

7

6.2

2

2.9

Dawn

2

1.8

2

2.9

Daylight

75

66.4

50

71.4

Dusk

2

1.8

1

1.4

Light not stated

1

0.9

4

5.7

No adverse weather condition

87

77.0

51

72.9

Rain

26

23.0

15

21.4

Other weather

0

0.0

2

2.9

Snow

0

0.0

2

2.9

Dry road condition

74

65.5

36

51.4

Snow road condition

1

0.9

2

2.9

Wet road condition

37

32.7

32

45.7

Road condition not stated

1

0.9

0

0.0

Compact causal vehicle

18

15.9

8

11.4

Full-size causal vehicle

10

8.8

16

22.9

Mid-size causal vehicle

35

31.0

18

25.7

Other vehicle

25

22.1

18

25.7

Pickup causal vehicle

17

15.0

8

11.4

School bus causal vehicle

1

0.9

0

0.0

Straight truck causal vehicle

2

1.8

1

1.4

Subcompact causal vehicle

1

0.9

0

0.0

Tractor semitrailer causal vehicle

2

1.8

1

1.4

Vehicle not stated

2

1.8

0

0.0

Table 21. Other crash variables at Ohio-Tylersville site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle crash

16

15.4

1

4.2

Backing-up crash

3

2.9

0

0.0

Fixed object crash

5

4.8

1

4.2

Head-on crash

0

0.0

0

0.0

Left-turn crash

6

5.8

1

4.2

Other non-collision

1

1.0

0

0.0

Rear-end crash

66

63.5

14

58.3

Sideswipe, meeting crash

1

1.0

0

0.0

Overturning crash

1

1.0

0

0.0

Sideswipe, passing crash

5

4.8

7

29.2

Dark, lighted

19

18.3

4

16.7

Dark, no light

7

6.7

1

4.2

Dawn

5

4.8

1

4.2

Daylight

71

68.3

18

75.0

Dusk

2

1.9

0

0.0

No adverse weather condition

82

78.8

21

87.5

Rain

18

17.3

2

8.3

Other weather condition

0

0.0

1

4.2

Snow

3

2.9

0

0.0

Fog

1

1.0

0

0.0

Dry

75

72.1

21

87.5

Snow

1

1.0

0

0.0

Wet

27

26.0

3

12.5

Ice

1

1.0

0

0.0

Compact causal vehicle

14

13.5

3

12.5

Full-size causal vehicle

14

13.5

3

12.5

Mid-size causal vehicle

30

28.8

9

37.5

Motorcycle causal vehicle

1

1.0

0

0.0

Panel truck causal vehicle

5

4.8

0

0.0

Other causal vehicle

22

21.2

6

25.0

Pickup causal vehicle

13

12.5

3

12.5

School bus causal vehicle

1

1.0

0

0.0

Straight truck causal vehicle

1

1.0

0

0.0

Subcompact causal vehicle

1

1.0

0

0.0

Tractor semitrailer causal vehicle

1

1.0

0

0.0

Causal vehicle not stated

1

1.0

0

0.0

Table 22. Other crash variables at Ohio-Hamilton-Mason site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle crash

8

10.0

0

0.0

Backing-up crash

2

2.5

0

0.0

Fixed object crash

4

5.0

0

0.0

Left-turn crash

2

2.5

0

0.0

Other noncrash

0

0.0

1

11.1

Rear-end crash

61

76.3

7

77.8

Sideswipe, passing

3

3.8

1

11.1

Dark, lighted

6

7.5

0

0.0

Dark, no light

8

10.0

2

22.2

Dawn

3

3.8

1

11.1

Daylight

62

77.5

6

66.7

Dusk

1

1.3

0

0.0

No adverse weather condition

64

80.0

8

88.9

Rain

10

12.5

1

11.1

Snow

6

7.5

0

0.0

Dry road condition

60

75.0

7

77.8

Snow road condition

4

5.0

0

0.0

Wet road condition

15

18.8

2

22.2

Ice road condition

1

1.3

0

0.0

Compact causal vehicle

16

20.0

3

33.3

Full-size causal vehicle

6

7.5

0

0.0

Mid-size causal vehicle

23

28.8

3

33.3

Panel truck causal vehicle

2

2.5

0

0.0

Other causal vehicle

17

21.3

3

33.3

Pickup truck causal vehicle

13

16.3

0

0.0

Straight truck causal vehicle

1

1.3

0

0.0

Subcompact causal vehicle

2

2.5

0

0.0

Table 23. Other crash variables at Texas-Evans site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle, both going straight crash

25

24.3

64

19.7

Opposite direction, both going straight crash

0

0.0

1

0.3

Od, one straight, one left-turn crash

9

8.7

21

6.5

One mv other crash

1

1.0

0

0.0

One mv going straight crash

4

3.9

22

6.8

One mv turning left crash

1

1.0

3

0.9

One mv turning right crash

1

1.0

1

0.3

Sd, both going straight, rear-end crash

12

11.7

74

22.8

Sd, both going straight, sideswipe crash

9

8.7

22

6.8

Sd, both left-turn crash

0

0.0

3

0.9

Sd, both right-turn crash

2

1.9

7

2.2

Sd, one straight, one left-turn crash

1

1.0

1

0.3

Sd, one straight, one right-turn crash

1

1.0

1

0.3

Sd, one straight, one stopped crash

37

35.9

105

32.3

Dark, lighted

20

19.4

70

21.5

Dark, no light

16

15.5

16

4.9

Dawn

0

0.0

3

0.9

Daylight

64

62.1

235

72.3

Dusk

0

0.0

1

0.3

Dark, unknown lighting

3

2.9

0

0.0

Clear/cloudy weather

91

88.3

297

91.4

No weather data

2

1.9

0

0.0

Rain

10

9.7

26

8.0

Fog

0

0.0

2

0.6

Dry road condition

83

80.6

291

89.5

Wet road condition

18

17.5

34

10.5

No road condition data

2

1.9

0

0.0

Od = opposite direction; mv = motor vehicle; Sd = same direction.

Table 24. Other crash variables at Texas-Stone Oak site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle, both going straight crash

5

11.9

21

12.4

Od, both going straight crash

0

0.0

1

0.6

Od, one straight, one left-turn crash

4

9.5

6

3.6

One mv other crash

1

2.4

0

0.0

One mv going straight crash

6

14.3

26

15.4

One mv turning left crash

0

0.0

1

0.6

One mv turning right crash

0

0.0

2

1.2

Sd, both going straight, rear-end crash

8

19.0

44

26.0

Sd, both going straight, sideswipe crash

5

11.9

12

7.1

Sd, one straight, one left-turn crash

0

0.0

1

0.6

Sd, one straight, one right-turn crash

0

0.0

1

0.6

Sd, one straight, one stopped crash

13

31.0

54

32.0

Dark, lighted

11

26.2

46

27.2

Dark, no light

2

4.8

12

7.1

Dawn

1

2.4

4

2.4

Daylight

25

59.5

105

62.1

Dusk

0

0.0

2

1.2

Dark, unknown lighting

1

2.4

0

0.0

Unknown lighting

2

4.8

0

0.0

Clear and cloudy weather

37

88.1

116

68.6

Unknown weather

1

2.4

33

19.5

Rain

4

9.5

18

10.7

Fog

0

0.0

2

1.2

Dry road condition

33

78.6

142

84.0

Wet road condition

8

19.0

27

16.0

No road condition data

1

2.4

0

0.0

Od = opposite direction; mv = motor vehicle; Sd = same direction.

Table 25. Other crash variables at Texas-New Guibeau site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle, both going straight crash

4

3.9

6

9.7

Od, both going straight crash

0

0.0

1

1.6

Od, one straight, one left-turn crash

5

4.9

1

1.6

One mv going straight crash

7

6.8

5

8.1

One mv turning right crash

1

1.0

0

0.0

Sd, both going straight, rear-end crash

22

21.4

14

22.6

Sd, both going straight, sideswipe crash

3

2.9

10

16.1

Sd, both left-turn crash

1

1.0

1

1.6

Sd, both right-turn crash

1

1.0

0

0.0

Sd, one straight, one stopped crash

59

57.3

24

38.7

Dark, lighted

24

23.3

10

16.1

Dark, no light

6

5.8

5

8.1

Daylight

71

68.9

43

69.4

Dusk

0

0.0

1

1.6

Dark, unknown lighting

2

1.9

3

4.8

Clear and cloudy weather

90

87.4

56

90.3

Unknown weather

4

3.9

1

1.6

Rain

8

7.8

4

6.5

Fog

1

1.0

1

1.6

Dry road condition

84

81.6

54

87.1

Wet road condition

15

14.6

7

11.3

No road condition data

4

3.9

1

1.6

Od = opposite direction; mv = motor vehicle; Sd = same direction.

Table 26. Other crash variables at Texas-Shaenfield site.

Variable Level

Before-Period

Number of Crashes

Before-Period

Percent of Total Crashes

After-Period

Number of Crashes

After-Period

Percent of Total Crashes

Angle, both going straight crash

9

11.1

13

15.9

Od, one straight, one left-turn crash

1

1.2

0

0.0

One mv going straight crash

6

7.4

7

8.5

One mv turning left crash

0

0.0

1

1.2

One mv turning right crash

0

0.0

1

1.2

Sd, both going straight, rear-end crash

13

16.0

20

24.4

Sd, both going straight, sideswipe crash

2

2.5

16

19.5

Sd, both left-turn crash

0

0.0

2

2.4

Sd, one straight, one left-turn crash

0

0.0

1

1.2

Sd, one right, one stopped crash

1

1.2

1

1.2

Sd, one straight, one stopped crash

49

60.5

20

24.4

Dark, lighted

11

13.6

24

29.3

Dark, no light

7

8.6

3

3.7

Dawn

1

1.2

1

1.2

Daylight

59

72.8

53

64.6

Dark, unknown lighting

3

3.7

1

1.2

Clear and cloudy weather

71

87.6

76

92.7

Rain

9

11.1

5

6.1

Fog

0

0.0

1

1.2

No weather data

1

1.2

0

0.0

Dry road condition

70

86.4

72

87.8

Wet road condition

10

12.3

10

12.2

No road condition data

1

1.2

0

0.0

Od = opposite direction; mv = motor vehicle; Sd = same direction.

Table 27. Other crash variables at Texas-71 site.

Variable Level

Before-Period Number of Crashes

Before-Period Percent of Total Crashes

After-Period Number of Crashes

After-Period Percent of Total Crashes

Angle, both going straight crash

45

28.8

2

12.5

Od, both going straight crash

1

0.6

0

0.0

Od, one straight, one left-turn crash

14

9.0

0

0.0

One mv going straight crash

19

12.2

2

12.5

One mv turning left crash

4

2.6

0

0.0

One mv turning right crash

1

0.6

1

6.2

Sd, both going straight, rear-end crash

21

13.5

4

25.0

Sd, both going straight, sideswipe crash

8

5.1

3

18.8

Sd, one straight, one left-turn crash

0

0.0

1

6.2

Sd, one straight, one right-turn crash

2

1.3

0

0.0

Sd, one straight, one stopped crash

41

26.3

3

18.8

Dark, lighted

22

14.1

4

25.0

Dark, no light

20

12.8

4

25.0

Dawn

4

2.6

0

0.0

Daylight

104

66.7

6

37.5

Dusk

3

1.9

0

0.0

Dark, unknown lighting

3

1.9

2

12.5

Clear and cloudy weather

140

89.7

11

68.8

Unknown weather

1

0.6

0

0.0

Rain

15

9.6

4

25.0

Fog

1

6.2

Dry road condition

136

87.2

11

68.8

Sand, mud, dirt road condition

1

0.6

0

0.0

Wet road condition

18

11.5

5

31.2

No road condition data

1

0.6

0

0.0

Od = opposite direction; mv = motor vehicle; Sd = same direction.

 

 

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