Abstract
Measurements have been performed of the sound pressure levels of highway noise sources, including trucks, with an array of microphones in the plane perpendicular to the direction of motion. The results show that highway sources exhibit quasi−omnidirectionality, when described in terms of A−weighted levels, at angles up to 45° above the horizontal independently of the type of vehicle or of the type of exhaust. For trucks there is limited evidence of a weak distortion of the directivity pattern of the radiated noise which increases with the number of wheels at high speed. One−third−octave−band spectral analysis at angles between 6° and 45° from the horizontal do not reveal a significant variation in the spectrum from one angle to another. For the purpose of highway noise prediction, it appears reasonable to assume that the noise radiated from conventional vehicles, including trucks, is omnidirectional.
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