All terminology used in this chapter, and not defined below, shall be in conformance with applicable publications of the American National Standards Institute (ANSI) or its successor body. For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
A OR C WEIGHTED SOUND LEVEL (SOUND LEVEL). The sound pressure level in decibels as measured on a sound meter using the A or C weighting network. The level so read shall be designated dB(A) or dBA or dB(C) or dBC.
DECIBEL. A logarithmic and dimensionless unit of measure often used in describing the amplitude of sound. DECIBEL is denoted as dB.
EMERGENCY VEHICLE. A motor vehicle used in response to a (public) calamity or to protect persons and property from imminent danger.
EMERGENCY WORK. Work made necessary to restore property to a safe condition following a public calamity, work to restore public utilities or work required to protect persons and property from an imminent danger.
GROSS VEHICLE WEIGHT. The value specified by the manufacturer as the loaded weight of a vehicle.
PERSON. Any individual, association, partnership, corporation or officer thereof.
SOUND. A temporal and spatial oscillation in pressure, or other physical quantity, in a medium with internal forces that causes compression and rarefaction of that medium, and which propagates at finite speed to distant points.
SOUND LEVEL METER. An instrument, including a microphone, amplifier, output meter and weighting networks, that is sensitive to pressure fluctuations. The output meter reads sound pressure level in decibels when properly calibrated and the instrument is of Type 2 or better as specified in American National Standards Institute Publication SI 4-1971, or its successor publication.
(2011 Code, § 13.0402)