Appendix D - Surrogate Safety Assessment Model and Validation: Final Report (FHWA-HRT-08-051)

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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
ID	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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