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![In Philadelphia for a week and noticed these white lights on the top of all the traffic lights. What is the purpose of them? Only noticed one that was light up and In Philadelphia for a week and noticed these white lights on the top of all the traffic lights. What is the purpose of them? Only noticed one that was light up and](https://external-preview.redd.it/jYyosSMVTTdhiuoZLLQrx-5U39pJ_p1NQMVpcHLoeAs.jpg?auto=webp&s=d2544103cc0f52b33dfb713badd3cef19d9a6334)