Increased trucking largely related to growth in freight volumes handled by Port Metro Vancouver facilities on Burrard Inlet, combined with increasing residential densities in the urban core led the City of Vancouver to retain WAL to conduct a survey of the noise environments along the City’s arterial road network. The study included continuous 24-hour unattended (instrument only) noise monitoring at 31 locations and continuous 24-hour attended monitoring at an additional 5 locations. In addition to establishing the daily average noise exposures at all 36 monitoring locations, the attended monitoring permitted the sources, occurrence rates and intensities of intrusive noise events (truck and bus pass-bys, sirens, horns etc.) to be established. This rating of the prominence of the various sources of intrusive noise events, taken in conjunction with the physical and temporal distribution of the various sources throughout the city, permitted the sources to be ranked in terms of their overall, city-wide noise impact potential.
Once the noise monitoring phase of the study was completed, the sound propagation modeling software CadnaA was used to create a three-dimensional model of the City of Vancouver arterial roads. The traffic noise measurement data, and traffic volumes provided by the City of Vancouver were used to calibrate arterial road noise emissions. The model was used to create sound level contours that showed the propagation of traffic noise from the roads and that could be used to visually identify the loudest locations. The model was also used to evaluate the effectiveness of various traffic noise mitigation strategies.