Excessive noise exposure is a serious global urban health problem, adversely affecting millions of people. One often cited source of urban noise is mass transit, particularly subway systems. Both existing and future noise levels in the study area are relatively high at almost all locations in the study area during almost all hours of the day.
They reflect the fact that traffic volumes throughout the study area are high, with relatively high truck and bus volumes. Platform doors could also improve service because train operators would not have to slow down as they approach crowded platforms, and they could reduce litter on the tracks, which can set off fires and cause delays.
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