#DECIBEL TEST FREE#
Posts or other discrete supports shall be ignored when ascertaining open free space. A traffic railing shall have at least 35% of its vertical height, from the ground surface to the top of the railing, open to free space in order to qualify as an acceptable object within a noise measurement test site. Traffic railing≺ longitudinal highway traffic barrier system installed along the side or median of a highway.
Soft test site≺ test site having the ground surface covered with grass, other ground cover or similar absorptive material for 1/2 or more of the distance between the microphone target point and the microphone location point. Relatively flat≺ noise measurement site which does not contain significant concave curvatures or slope reversals that may result in the focusing of sound waves toward the microphone location point is relatively flat. Microphone pointThe unmarked location on the center of the lane of travel that is closest to the microphone. Microphone line≺n unmarked reference line running parallel to the vehicle path and passing through the microphone. Hard test site≺ test site having the ground surface covered with concrete, asphalt, packed dirt, gravel or similar reflective material for more than 1/2 the distance between the microphone target point and the microphone location point. Ground cover≺ny of various low, dense-growing plants, such as ivy, myrtle, low weeds or brush. The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise: (2) Racing vehicles which are operated in an organized racing or competitive event conducted under a permit issued by local authorities. This chapter prescribes procedures for inspection, surveillance and measurement of motor vehicles operated on a highway to determine whether those vehicles are constructed, equipped, maintained and operated to conform with the established sound levels in § 157.11 (relating to vehicular noise limits).
#DECIBEL TEST CODE#
Code § 175.181 (relating to exhaust systems). Code § 175.152 (relating to exhaust systems) and 67 Pa. Code § 175.105 (relating to exhaust systems) 67 Pa. Code § 175.75 (relating to exhaust systems) 67 Pa. The provisions of this Chapter 157 adopted August 26, 1977, effective August 27, 1977, 7 Pa.B. The provisions of this Chapter 157 issued under the Vehicle Code, 75 Pa.C.S. MEASUREMENT OF NOISE EMISSION HIGHWAY OPERATIONS 157.41 F. CHAPTER 157. ESTABLISHED SOUND LEVELS Subchap.Ī.
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