Optimization of Urban Highway Bypass Horizontal Alignment: A Methodological Overview of Intelligent Spatial MCDA Approach Using Fuzzy AHP and GIS

Table 2

Nine-point Saaty intensity important scale (Saaty [18]).

Intensity of importance	Definition	Description
1	Equally important	Two factors contribute equally to the objective
3	Moderately more important	Experience and judgment slightly favor one over the other
5	Strongly more important	Experience and judgment strongly favor one over the other
7	Very strongly more important	Experience and judgment very strongly favor one over the other. Its importance is demonstrated in practice
9	Extremely more important	The evidence favoring one over the other is of the highest possible validity
2, 4, 6, 8	Intermediate values	When compromise is needed
Reciprocals of above nonzero	If an element 𝑖 has one of the above numbers assigned to it when compared with element 𝑗, then 𝑗 has the reciprocal value when compared with 𝑖
Ratios	Ratios arising from the scale	If consistency was to be forced by obtaining 𝑛 numerical values to span the matrix