Transportation

Transportation noise studies begin with an analysis of a particular site’s existing conditions and surrounding noise sources (roadways, railroads, or airports). The future noise impact upon the proposed site, including all residential and commercial buildings and public and private outdoor recreation areas, is then determined using a variety of methods. These include on-site noise measurements at varying heights, computer modeling using the FHWA Traffic Noise Model (TNM) and CadnaA, and the HUD Noise Guidebook.

Upon calculation of the future noise level impact throughout a site, mitigation measures are designed as necessary to reduce indoor and outdoor noise levels to comply with local and/or federal noise ordinances. Indoor mitigation is determined using Phoenix Noise & Vibration’s in-house building shell analysis software which evaluates a proposed building structure and specifies the STC ratings of various building elements (exterior walls, roof, windows, doors, other miscellaneous components) required to maintain the applicable indoor noise level. A building shell analysis can be very general, conducted for an entire building, or very detailed, conducted for each individual room. Outdoor mitigation, which can include noise barriers, berms, and site planning, is developed using the barrier optimization tools in TNM and CadnaA.

Ground vibration from highways and railways can also negatively impact existing or proposed structures. Ground vibration can be measured directly and compared to industry standards for compliance according to the specific building use.

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