Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 157 - ESTABLISHED SOUND LEVELS
Subchapter B - NOISE LIMITS
Section 157.12 - Measurement tolerances
Universal Citation: 67 PA Code ยง 157.12
Current through Register Vol. 54, No. 44, November 2, 2024
(a) Factors. Measurement tolerances shall be allowed to take into account the effects of the following factors:
(1) The consensus standard practice of
reporting field sound level measurements to the nearest whole
decibel.
(2) Variations resulting
from commercial instrument tolerances.
(3) Variations resulting from the topography
of the noise measurement site.
(4)
Variations resulting from atmospheric conditions such as wind, ambient
temperature, and atmospheric pressure.
(5) Variations resulting from reflected sound
from small objects allowed within the test site.
(6) The interpretation of the above cited
factors by enforcement personnel.
(b) Limitations. Measurement tolerances shall not exceed two decibels for a given measurement.
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