Calumet City, Illinois Roadblocks
Usually set up for traffic northbound, however on rare occasions, they will divert southbound traffic as well.
This roadblock is normally setup around the holidays. ie, Christmas, New Years, Thanksgiving. However the police have also been know to set this roadblock up when they need a PR boost.
Checking for pretty much anything they could find late at night.
This was a late-night roadblock.