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(From Our Regular Correspondent)Oct. 26, 1935.
Reduction of the Noise of Vehicles
The campaign against noise, mainly traffic noise, and the formation of the Anti-Noise League have been described in previous letters. The government has been induced to take action by prohibiting the use of motor horns in cities at certain hours. But it has not stopped at this. The Ministry of Transport has appointed a committee to investigate the noise of road vehicles. It has measured the volume of noise made by motorcycles on the road. This foreshadows the time when every vehicle must comply with a certain maximum of measured noise. A new unit of noise, the phon, has been introduced. The noise of a subway train, with the windows open, has been measured at between 90 and 95 phons, which is the greatest noise that a car will be allowed to make in the future,
Foreign Letters. JAMA. 1935;105(21):1694-1700. doi:10.1001/jama.1935.02760470048021