Editing Traffic enforcement camera (section)

===Noise pollution camera ("noise radar")===
Noise enforcement cameras are used to monitor and enforce compliance with local or national vehicle noise limits.

Noise cameras follow the same basic construction: a microphone linked to an ANPR video camera, mounted at a fixed location or on a mobile tripod. The ANPR camera is triggered when the microphone detects a passing vehicle emitting a sound signal above a pre-set decibel limit, capturing the vehicle registration and giving police or local government recourse to warn, fine, or prosecute the registered owner. These cameras have been designed to respond to mass complaints about vehicle noise (in 2020 New York City recorded over 99,000 noise complaints specifically related to vehicles).<ref>{{cite web|last=Cruz|first=David|date=2021-08-28|title=Manhattan Lawmaker Proposes Bill To Curb Loud Motor Vehicle Noise Using Surveillance Radar Technology|url=https://gothamist.com/|access-date=2021-12-02|website=Gothamist|language=en}}</ref>

Trials of noise cameras have been conducted in cities worldwide. In Taipei, fines range from US$65 to US$130, with additional fines for illegally modified exhausts of up to US$1000. The noise camera scheme won 90% voter approval; the national government then earmarked $4m to build a national network of noise cameras, including mobile cameras.<ref>{{cite web|date=2021-10-22|title='Noise camera' finds favor with public: officials - Taipei Times|url=https://www.taipeitimes.com/News/taiwan/archives/2021/10/22/2003766564|access-date=2021-12-02|website=www.taipeitimes.com}}</ref>

In 2020 the [[Department for Transport|UK Department for Transport]] published a feasibility study commissioned from a joint venture between engineering consultancies Atkins and Jacobs.<ref>{{cite web|title=Roadside Vehicle Noise Measurement|url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1007868/roadside-vehicle-noise-measurement-phase-2-final-report.pdf}}</ref> The Atkins/Jacobs noise camera setup was unable to consistently derive sound readings from cars travelling less than ten seconds apart from other vehicles. This camera was a trial unit that hasn't since been deployed. Similar results were found in a trial in [[Edmonton, Canada]] undertaken in 2018. Local government cited technical shortcomings with the trial setup to explain spending $192,000 on noise cameras that recouped $98,000 in fines.<ref>{{cite web|last=Rosove|first=Jay|date=2021-02-12|title=Edmonton's latest vehicle noise reduction pilot came with challenges: city report|url=https://edmonton.ctvnews.ca/edmonton-s-latest-vehicle-noise-reduction-pilot-came-with-challenges-city-report-1.5307731|access-date=2021-12-02|website=Edmonton|language=en}}</ref>