Measurement of International Roughness Index by Using 𝑍-Axis Accelerometers and GPS

Table 2

Results for the left and right wheels.

Number of links selected	Left-wheel square root value	Right-wheel square root value	Standard IRI
1	5.1634	4.2223	5.704
2	6.3474	5.2826	9.062
3	4.0195	3.2460	3.451
4	3.9012	3.2666	3.874
5	4.3624	3.4117	3.959
6	3.5366	2.2714	2.281
7	5.2493	4.1268	5.915
8	4.3359	3.5055	4.838
9	4.2007	3.0775	4.340
10	5.0837	3.7241	5.403
11	4.4185	3.1880	3.991
12	4.4069	3.5530	4.290
13	5.0762	4.1863	5.614
14	4.9560	4.2084	5.701
15	3.7991	3.2827	3.629
16	4.0984	3.2920	3.963
17	3.9900	3.3378	4.861
18	3.0861	2.5950	2.517
19	3.5595	3.3126	3.537
20	3.2307	2.5859	2.697