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

Table 4

Variance analysis of factors influencing on curved upgrades.

Source	Sum of squares	df	Mean square	value	Critical value
Corrected model	0.186	9	0.021	32.686
Intercept	1.731	1	1.731	2731.354
Radius	0.146	3	0.049	77.008
Grade	0.001	3	0.000	0.414
Speed	0.039	3	0.013	20.637
Error	0.004	6	0.001
Total	1.921	16
Correct total	0.190	15