Speed traps?

[bobobb.livejournal.com]

My friend said that she was driving on Broadway last night and saw a bunch of blue lights on video cameras pointed at intersections.  Are these speed traps or cameras snapping pictures of people who run red lights?

Comments

[concrete.livejournal.com]

used to be, but traffic engineers find cameras are better and easier than loops.

[diatomacearth.livejournal.com]

...Concrete? Like the comic, yes?