green means go

an interaction with lily while driving home this afternoon (we are stopped at a red light):

me: rummaging around looking for something behind me

lily: go!

me: glancing up oh, i guess the light is green now. 

this has happened a few times now, if we don't start driving as soon as the light turns green (sometimes we're behind other cars and have to wait our turn), she tells me to "go."  so, she knows at least one color (by sight, anyway), and knows that it means we're supposed to drive.  good looking out, lily.