I was driving on the freeway heading west. The fireball appeared directly in front of me and fell quickly and steeply to the right (NW). I lost sight of it behind some vegetation. It was about the size of a fingernail at arm's length- the largest fireball I have ever seen. Extremely bright light green, although I think there may have been white and maybe yellowish behind it. No trail in the sky. It took me another 2 minutes to reach my destination so if there was a sound I missed it.