Waiting for Speedway Fowler

This is a photo of the streetlight at the corner of June and Chandler. If you click on it and enlarge it, you can see a wire running from one angle of the frame, connecting at the top of the post and then going off in another direction. This wire connects ALL the lamp posts from the corner of Chandler and June down at least as far as Lovell Street. It criss-crosses the street several times. I'm not sure how far it goes in the other direction, but I traced it along about thirty street lights and it DOES take the turn and head down June Street past the old West Side Station post office. I don't know what this could possibly be for. Lightning protection? Some sort of radio use?