Table 5. Descriptions of crashes from the segment of National Freeway G15.

Variables Title	Definition	Frequency	Percent %	Cumulative percent %
Crash Tim2e	00:01~04:00	43	6.1	6.1
	04:01~08:00	88	12.4	18.5
	08:01~12:00	151	21.3	39.8
	12:01~16:00	176	24.9	64.7
	16:01~20:00	166	23.4	88.1
	20:01~24:00	84	11.9	100
Crash Location	Roadway	112	15.8	15.8
	Toll Gate	353	49.9	65.7
	Ramp and Weaving Area	243	34.3	100
Precipitation Type	Rain	323	45.6	45.6
	Rain Intensity I	278	39.3	39.3
	Rain Intensity II	25	3.5	42.8
	Rain Intensity III	11	1.5	44.3
	Rain Intensity IV	9	1.3	45.6
	Non-Rain	385	54.4	100
Crash Vehicle Type	Small Vehicle	658	76.9	76.9
	Large Vehicle	198	23.1	100
Crash Type	Fixed-object Crash	251	35.5	35.5
	Rear-end Crash	248	35.0	70.5
	Side Crash	151	21.3	91.8
	Others	58	8.2	100
Traffic volume (V/C)	≤ 0.67	221	31.2	31.2
	> 0.67	487	68.8	100
Crash Severity	Slight Crash	568	80.2	80.2
	General Crash	90	12.7	92.9
	Serious Crash	35	5.0	97.9
	Fatal Crash	15	2.1	100