Using Multidimensional Data to Analyze Freeway Real-Time Traffic Crash Precursors Based on XGBoost-SHAP Algorithm

Table 6

Distribution of weather features in crash and noncrash data.

Weather features		Crash		Noncrash
		Quantity	Percentage (%)	Quantity	Percentage (%)
Rainfall	0–4	131	79.88	601	91.62
	4–10	20	12.20	39	5.95
	>10	13	7.93	16	2.44
	Sum	164	100	656	100
Visibility	<1	1	0.61	2	0.30
	1–5	67	40.85	188	28.66
	5–10	83	50.61	377	57.47
	>10	13	7.93	89	13.57
	Sum	164	100	656	100
Dew point	<10	18	11.69	36	5.49
	10–15	130	84.42	573	87.35
	15–20	15	9.74	45	6.86
	>20	1	0.65	2	0.30
	Sum	164	100	656	100
Temperature	<10	63	38.41	254	38.72
	10–20	36	21.95	141	21.49
	20–30	64	39.02	257	39.18
	>30	1	0.61	4	0.61
	Sum	164	100	656	100
Wind speed	0–9	79	48.17	319	48.63
	9–18	74	45.12	295	44.97
	18–27	9	5.49	35	5.34
	>27	2	1.22	7	1.07
	Sum	164	100	656	100