Their offices and quarries (Mankato & Owatonna), are posted with signs not meeting State Regs.
I'll post a pic of their 'standard sign' once I get the chance to snap one.
Unfortunately, as a truck driver that hauls gravel/rock products from their facilities, I have to deal with this.
Since I rarely have to get out of the truck, I carry anyways. If I do have to get out, I throw my 'bulky shirt' on.