A Hybrid Algorithm of Traffic Accident Data Mining on Cause Analysis

Table 1

Coding schedule of attributes on road condition.

The name of attributes	Coding of association rule
	Attribute value	Coding
	Intact	1
	In construction	2
Road surface condition	Concave-convex	3
	Collapsed	4
	Roadblock	5
	Others	6
	Not separated	1
Road physical separation	Median separated (1)	2
	Separated between vehicles and nonvehicles (2)	3
	(1) and (2)	4
	Straight line	1
	Common turn	21
	Sharp turn	22
	Common slope	31
Road alignment	Steep slope	32
	Continuous downward slope	33
	Regular slope	41
	Sharp turn and steep slope	42
	Regular slope turn	51
	Regular turn slope	52
	Guard rail	1
	Barrier wall	2
Roadside safeguarding types	Barrier barrel	3
	Others	4
	None	5