I was heading south on Il route 251 at 9:34 PM on Wednesday April 11 2012. The fireball was on my left side or east of me heading south. It was green with no train that I could see. From my perspective it was perhaps over the city of Chicago which is 90 miles east from where I saw it. This is now the third fireball I have seen in about a month. Although this one was not as spectacular as the last one I saw it is starting to concern me that I am seeing them as often as I am. In the right place at the right time?