Section 26.01.37.050 - TEST PROCEDURE01.Test Site. The test site must be a flat, open surface free of large reflecting surfaces, other than the ground, such as parked vehicles, signboards, or hillsides located within sixteen (16) feet of the (OHV) being tested and the location of the microphone of the sound level meter. a. Ambient sound level. The ambient sound level, including wind effects, at the test site due to sources other than the OHV being measured must be at least ten (10) dB lower than the sound produced by the OHV under test.b. Wind speed. Wind speed at the test site must be less than twenty (20) miles per hour.c. Persons in test area. While making sound level measurements, not more than one (1) person other than the operator, the measurer, and the assistant, if necessary, may be within ten (10) feet of the OHV under test or the microphone of the sound level meter, and that person must be directly behind the measurer on a line through the microphone of the sound level meter and the measurer.02.Test Surface. The surface of the ground within the test area must be paving or hard packed earth, level within an average slope of five (5) inches per foot and must be free of loose or powdered snow, plowed soil, grass of a height greater than six (6) inches, trees, or other extraneous materials.03.Position of OHV. a. For two (2) wheeled OHV's, the operator may sit astride of the OHV, in normal riding position with both feet on the ground. If this is not possible because of the seat height of the OHV, an assistant may hold the OHV by the forks, front wheel, or handlebars so that it is stationary with its longitudinal plane of symmetry vertical. If an assistant is not available to assist in holding the OHV upright, the operator may use a box, rock or other object to rest his feet upon to steady the OHV, so long as the OHV longitudinal plane of symmetry is vertical and stationary.b. For three (3) wheeled and four (4) wheeled ATV's, the operator may sit in the normal riding position with one (1) or both feet on the footrests.04.Operation of OHV. a. If the OHV has a neutral gear, the operator must run the engine with the gear box in neutral at a speed equal to one-half (1/2) of the rated engine speed or one-half (1/2) of the red line speed specified by the manufacturer as compiled in the "Off Highway Motorcycle and ATV Stationary Sound Test Manual."b. If the OHV has no neutral gear, it must be operated either with the rear wheel(s) at least two (2) inches clear of the ground or with the drive chain or belt removed, or the clutch, if the OHV is so equipped, disengaged.05.Engine Temperature. The engine of the OHV being tested must be at a normal operating temperature during the test.Idaho Admin. Code r. 26.01.37.050