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Publication Number: FHWA-HRT-08-051
Date: June 2008

Surrogate Safety Assessment Model and Validation: Final Report

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Appendix D. Gap Configuration and Conflict Frequency

Table 126 provides total conflict counts observed (both including and excluding simulated crashes) for three different minimum gap settings in VISSIM. These results are based on a single 1-hour simulation run with the same seed number.

Table 126. Gap Sizes of 4, 5, and 6 Seconds and Their Corresponding Conflict Counts.

ID

Gap Size 4 sec

Gap Size 5 sec

Gap Size 6 sec

Including Simulated Crashes

Excluding Simulated Crashes

Including Simulated Crashes

Excluding Simulated Crashes

Including Simulated Crashes

Excluding Simulated Crashes

1

96

76

92

80

122

97

2

41

38

36

34

38

35

3

76

70

80

79

74

72

4

47

45

22

21

52

49

5

42

41

42

42

42

38

6

206

106

217

122

201

125

7

122

90

121

90

130

107

8

88

77

95

85

95

79

9

54

53

66

64

57

57

10

84

80

79

70

81

71

11

77

72

72

67

74

68

12

205

130

181

115

176

126

13

55

53

59

58

65

64

14

77

68

76

65

84

76

15

158

87

153

88

151

83

16

55

54

59

58

56

55

17

122

102

120

102

140

101

18

147

119

158

124

152

122

19

70

65

65

60

70

62

20

81

68

114

100

100

91

21

84

67

70

58

71

62

22

25

23

28

26

23

21

23

121

99

89

76

115

99

24

88

71

134

114

158

131

25

128

108

118

100

95

89

26

152

124

168

126

175

139

27

91

82

88

76

92

82

28

70

56

74

65

71

60

29

76

68

81

69

77

67

30

82

69

83

69

83

69

31

79

73

100

94

94

84

32

87

71

99

81

131

93

33

99

65

109

80

114

88

34

110

89

106

93

100

89

35

47

46

45

44

45

44

36

84

77

85

82

85

76

37

56

56

52

51

73

71

38

111

86

137

102

165

120

39

75

64

62

59

77

69

40

93

77

109

86

97

73

41

19

16

24

23

22

21

42

141

112

187

146

155

119

43

52

50

42

38

63

61

44

64

63

67

63

75

69

45

30

27

33

31

34

32

46

54

52

53

48

61

52

47

73

64

73

67

72

64

48

101

85

22

20

102

92

49

98

92

81

75

88

83

50

74

71

63

57

67

62

51

79

62

86

70

85

73

52

84

79

72

69

70

66

53

114

107

122

100

108

93

54

59

52

63

53

83

75

55

196

141

238

159

172

131

56

134

103

124

100

98

91

57

289

128

287

134

286

146

58

51

50

54

53

55

54

59

51

47

51

45

51

45

60

130

120

134

125

143

131

61

61

56

64

57

66

61

62

37

32

36

32

35

31

63

58

40

76

58

93

58

64

46

43

48

45

58

53

65

103

101

84

82

96

96

66

143

117

132

107

162

134

67

103

78

101

90

119

99

68

115

106

94

89

106

95

69

33

32

34

34

38

36

70

34

34

36

35

35

34

71

43

38

42

36

50

43

72

43

43

47

47

64

64

73

51

50

61

60

61

59

74

83

67

83

67

82

68

75

45

45

48

48

54

53

76

52

48

68

62

76

71

77

70

65

63

61

66

61

78

94

74

79

59

85

70

79

87

65

92

72

87

67

80

30

25

35

32

36

30

81

26

23

24

23

32

32

82

61

56

57

54

59

58

83

44

43

39

38

30

30

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