Section 120(4) in The Central Motor Vehicles Rules, 1989
(4)[ In the case of power tiller with a riding attachment or power tiller coupled to trailer, the noise level when tested as per IS:12180:2000, as amended from time to time,shall not exceed 88dB(A) at the bystander position and 98dB(A) at the operators ear level.] [Sub-Rule(4) inserted by GSR 589(E), dated 16.9.2005 (w.e.f. 1.10.2006).]