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

Table 3

Weather features and their values.

Weather features	Scope	Variable values
Rainfall (mm)	0–5	1
	5∼10	2
	>10	3
Visibility (km)	<1	1
	1–5	2
	5–10	3
	>10	4
Dew point (°C)	<10	1
	10–15	2
	15–20	3
	>20	4
Temperature (°C)	<10	1
	10–20	2
	20–30	3
	>30	4
Wind speed (km/h)	0–9	1
	9–18	2
	18–27	3
	>27	4