Q: what are those new cameras on Park for? 

Does anybody have any idea? This is from a reader of the blog:

Anthony, Yesterday they put up what looks like cameras in front of the Auxiliary Police House on park Ave. I could not stop to take a picture, but it looks like there are 3 cameras (one pointing at each lane) on a gantry(?) over the westbound lanes. Been out of the loop and was wondering if you know anything about this.

[Updated with photo]