Low-Cost Portable Road Smoothness Testing Method Based on Pseudo-Vibration Velocity Range

Table 2

Fitting results of V Range and IRI when the vehicle is driving at a uniform speed of 60 km/hr.

IRI (m)	10	20	30	40	50	60	70	80	90	100
R^2	0.138	0.380	0.546	0.626	0.737	0.688	0.691	0.741	0.846	0.895
a	0.068	0.112	0.145	0.150	0.157	0.149	0.158	0.173	0.185	0.181
b	1.458	0.731	0.197	0.108	−0.005	0.095	−0.050	−0.273	−0.464	−0.411