OREGON Definitions - BIPAC

(b) Motor vehicle warning devices are exempt from these regulations;
(c) Vehicles equipped with at least two snowtread tires are exempt from the noise limits of Table 3 ;
(d) Motor vehicles described in subsection (1)(c) of this rule, which are demonstrated by the operator to
be in compliance with the noise levels in Table 3, for operation greater than 35 mph, are exempt from
these regulations;
(e) Auxiliary equipment operated on construction sites or in the maintenance of capital equipment or to
avoid or reduce the severity of accidents or operated on a farm for agricultural purposes or operated on
forest land as defined in subsection (1) of ORS 526.324 for activities related to the growing or harvesting
of forest tree species are exempt from these regulations.
(4) Equivalency:
(a) The in-use motor vehicle standards specified in Table 2 and3 have been determined by the
Department to be substantially equivalent to the 25 foot stationary test standards set forth in 1977
Oregon, Laws, Chapter 273;
(b) Tests shall be conducted according to the procedures in Motor Vehicle Sound Measurement Procedures
Manual (NPCS-21) or to standard methods approved in writing by the Department.