Modeling of Lateral Stability of Tractor-Semitrailer on Combined Alignments of Freeway

Table 5

Variance analysis of factors influencing the LTR on curved upgrades.

Source	Sum of squares	df	Mean square	value	Critical value
Corrected model	0.243	9	0.027	34.915
Intercept	3.042	1	3.042	3926.216
Radius	0.178	3	0.059	76.416
Grade	0.001	3	0.000	0.507
Speed	0.065	3	0.022	27.821
Error	0.005	6	0.001
Total	3.291	16
Correct total	0.248	15