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

Table 1

Fitting results of V Range and IRI when the vehicle is driving at a uniform speed of 40 km/hr.

IRI (m)	10	20	30	40	50	60	70	80	90	100
R^2	0.234	0.400	0.511	0.663	0.754	0.663	0.696	0.752	0.814	0.873
a	0.078	0.109	0.117	0.137	0.146	0.126	0.136	0.154	0.151	0.161
b	1.812	1.290	1.151	0.825	0.673	0.989	0.820	0.530	0.587	0.423