Excessive lighting also disrupts wildlife behavior and impacts the natural rhythms of the environment. A study published in the journal Science Advances, estimated that artificial skyglow resulting from outdoor lighting, including traffic camera lights, has increased at a rate of 2.2% per year.
In order to combat light pollution, progressive cities such as Barcelona, London, Oslo, and San Diego, are adopting smart streetlights that dim when not needed. Motion sensors are employed to provide light only when necessary and shielded lighting is being implemented to focus light where it’s required, minimizing spillage into surrounding areas.
But what about the traffic cameras that need to operate around the clock? Engineers and urban designers have been working on developing cameras that emit less light while still capturing clear images. Here are a few approaches they are taking:
Shielding and directed lighting
One method involves installing shields around traffic cameras and using directed lighting techniques. This helps to focus the light only on the required areas while minimizing light pollution in other directions. The problem with this approach, however, is that these modifications require significant up-front investment and ongoing maintenance which, understandably, is causing many urban areas to hesitate.
Cameras with invisible light sensors
Another approach involves the use of invisible light sensors which significantly reduce the reliance on blinding flashes for successful imaging. Traffic cameras with this technology can operate within the non-visible spectrum. They effectively capture images without the intense bursts of light that pierce the night. This approach is particularly effective in areas with high levels of light pollution, where it is important to minimize the additional impact of traffic camera lights.