Also, the post-hoc analysis (see Table 4) indicates that the difference between the noise level for the Type 1 buses
and the noise level for the Type 2 buses was significant and/or that the difference between the noise level for the Type 1 buses and Type 3 buses, was significant, and/or the difference between the noise level for the Type 3 buses and the noise level for the Type 2 buses was significant.