Skip to main content

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