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Journal of Materials Science: Materials in Engineering

Table 4 ISO Road classification (ISO 8608 (1995))

From: GA-based multi-objective optimization of active nonlinear quarter car suspension system—PID and fuzzy logic control

Road class

Degree of roughness ϕ(no) (10− 6 m2/(cycle/m))

Where no = 0.1 cycle/m

Lower limit

Geometric mean

Upper limit

A (very good)

–

16

32

B (good)

32

64

128

C (average)

128

256

512

D (poor)

512

1024

2048

E (very poor)

2048

4096

8196

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