Table 2.

Multiple collinearity test.

Variables	Collinearity statistics
	Tolerance	VIF
Residents' consumption level	0.032	31.172
Per capita disposable income	0.032	31.003
Gross domestic product	0.312	3.203
New road mileage	0.920	1.087
Traffic investment	0.440	2.275
Newly increased population	0.904	1.106
New vehicle ownership	0.710	1.409

VIF: variance inflation factor, GDP: gross domestic product.