What's the purpose of the blue lights atop traffic signals?
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Hildesheim causes confusion with blue traffic lights!
/cloudfront-us-east-1.images.arcpublishing.com/gray/QSRYTGTBDNIYROODVEMEAIEN4Y.jpg "Tattle-Tale Lights\" to help stop red light runners")
Tattle-Tale Lights" to help stop red light runners
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/cloudfront-us-east-1.images.arcpublishing.com/gray/JZM2C6MJTZAKXE3KTUG3JLX4TQ.JPG "What are those blue lights you're seeing on stoplights in Moorhead?")
What are those blue lights you're seeing on stoplights in Moorhead?
What Are Those Blue Lights For Atop Traffic Signals? - WUFT News
