Figure 15. Microphone positions for construction equipment noise measurements. There are two diagrams in this figure; one for stationary measurements and one for mobile measurements. For stationary measurements, a microphone is placed 15 meters perpendicular to each side of the construction equipment. A 90° angle is formed between each microphone. For mobile measurements, a microphone is placed 15 meters from the center of the nearest lane. An arrow pointing to the right on the roadway indicates the pass by direction.

return