The device measures noise in decibels, including traffic; green display numbers indicate an acceptable level of noise (deemed by experts to be under 60dB), while boisterous nighttime revelers can turn the numbers red.
The Dlouhá street noise meter is a pilot project that could see expansion into other parts of Prague 1 in the future. It is intended to draw attention to what many see as an ongoing problem.
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“It will not be as if the red lights up, the police will rush in and punish someone,” Ivan Solil, safety councilor for Prague 1 told iDnes. “We want to show transparently the conditions in which people live there.”
The district has been appealing to City Hall to revise opening hours of bars and clubs in the center. According to the city, however, such legislation could be legally problematic.
Prague 1 isn’t the only district to monitor noise: in May 2018, Prague 5 installed an acoustic sensor to monitor noise at Smíchovská Náplavka another notorious noise zone, while residents of Prague 2 are pushing for a similar sensor.