So, this all started last Monday while I was heading back to school. I was driving 355 southbound around 7am, and I see a DOT State Trooper sitting on the the northbound side, on this concrete pad with a sign in front of him that had a red LED read out. I didn't pick up any radar or laser signals with any of my gadgets. In my picture it's not lit up, but it's black sign on the post.
Today I talked to a local (not state) cop about them. What he's heard around his department is they have 4 of these such set ups, 2 NB, 2 SB, with a permanent mount speed measurement system (he called it radar), all on the new 355 extension (south of 55). The only one I've been able to spot is at mile marker 2 heading northbound, with a purpose built concrete pad for officers to park on.
Poor pictures because it is raining.
Pictures of the screen heading NB.
Pictures heading SB
These are the only sensors I saw alongside the road. There were maybe 15-20 of them total in the stretch between 55 & 80. The solar panel is pointed southward, along with what looks like a weather vein, and some white box point perpendicular to the road way. I'm thinking this is some reader for the transponders in trucks, or if they're really evil our I-PASSs.
Anybody in Chicago know what these are?
My current theory is it has some read out that relates to the semi-trucks, since it was a DOT ISP Tahoe sitting there.