The Challenge
The California DOT (Caltrans) needed a study of traffic noise exposure and the effects of reflections from noise barriers.
The Strategy
HMMH conducted the study in close coordination with community groups. We provided extended long-term monitoring and detailed reporting of existing traffic noise levels at many locations within the community. The ongoing program involves short-term noise monitoring before, during, and after a roadway-widening program, which includes:
- Replacing a noise barrier
- Applying sound-absorbing materials to the barriers
- Resurfacing the road with open-graded asphalt to reduce noise emissions
