Factors Affecting Crash Involvement of Commercial Vehicle Drivers: Evaluation of Commercial Vehicle Drivers’ Characteristics in South Korea

Table 6

Model estimation results for significant independent variables.

Variable	Local bus		Express bus		Taxi		Truck
	Coef.	St. dev.	Coef.	St. dev.	Coef.	St. dev.	Coef.	St. dev.
Driver age; (ref.: 21–30)
31–40	−0.83		−1.76		−1.61	5.20	−1.47	3.49
41–50	0.08		−0.11		−0.34		−0.31
51–60	0.77		0.14		1.19	0.87	−0.03
61 and above	0.97		0.53		1.70		0.25
Violation rate	0.83	1.59	0.90	0.59	1.45	1.51	0.92	1.33
Driving experience	−0.03	0.01	−0.02		−0.04	0.01^.	−0.03	0.02
Job change rate	0.01		0.04		−0.44	5.65	0.06
Crash rate	0.60		0.72		1.25		1.00
Constant	−2.20		−2.69		−3.02		−2.89
Number of observations	75,435		46,839		285,476		219,844

Note. Coef. = coefficient, st. dev. = standard deviation, , , , and^..