In many areas the street lighting circuits are hot 24 hrs a day. In those installations the fixture has a removable twistlock photocell mounted to the top. Many are 480 volt as well. Much of the street lighting and traffic signal circuits in older cities is rubber insulated installed in fragile conduit called orangeburg, I believe. It is a wood fiber/asphalt or asbestos/asphalt or in some cases concrete pipe. Much of it has been crushed and damaged over the years. I worked on networking the 2500 traffic signals in Washington, DC back in the 80's--what a mess!