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HMMH has a nationwide reputation for technical excellence in highway noise and vibration control. Our clients include engineering firms, state departments of transportation, the Federal Highway Administration (FHWA), private land developers, and homeowners. Our innovative solutions include the development of the FHWA’s highway noise prediction computer program, the Traffic Noise Model (TNM).

Specific areas of expertise include: noise barrier design, EAs/EISs, low noise pavement, priority studies, special traffic noise studies, Traffic Noise Model (TNM) development, and Virtual Soundscapes. We bring specialized experience through hundreds of studies in highway noise and vibration.

HMMH also specializes in mobile source air quality impacts. 

quote HMMH's understanding of state and federal requirements along with
their responsiveness to project needs make HMMH the gold standard
in their field. quote —Ed Hollingshead, Fay, Spofford & Thorndike, Inc.