Michigan State Police are trying to figure out who hacked an M-DOT sign, and wrote a racial slur about Trayvon Martin on it.
The road sign along I-94 calls Martin the "n" word.
Drivers saw it this morning and called police.
When troopers arrived to take down the message, they found the control box was unlocked and the keyboard used to write messages was gone.
The offensive message has been taken down.
