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The sound levels on balconies above the 8th floor of high-rise buildings situated 200 ft or so from freeway edge-of-pavements were found to be about 10 dB higher than those occurring on the ground floor. Equivalent sound levels on these balconies during the day were in the range 70-80 dBA depending on the size of the freeway; these sound levels are as high as those at ground level 50 ft from the edge-ofpavements of the fre. eways concerned. However, the use of sound absorptive material on a normal frontwalled balcony was shown to produce substantial noise reductions: treatment of the ceiling alone resulted in a 4-5 dB reduction, while a 7-8 dB reduction occurred with the addition of absorption equal, in Sabins, to a little over one-third the area of the balcony surfaces.

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