Red means stop, green means, um, what does green mean?

I live way on the north side of the city and work on the south side, in an area where public transit is poor.  So, I drive to work.  You know what annoys me more than wasting gas or sitting in traffic during rush hour?  It's the Traffic Control Aides.  These Traffic Control Aides wear orange vests,  wave light saber-type things and are there to tell drivers that, yes, the light is red.  You must stop!  They gesture wildly, wave their arms and light sabers at us.   Because you know we've never seen STOP.   When it turns green, they let us know it's okay to go!  Great.  Thanks!  I wouldn't understand that the left arrow with a green light would actually mean it's okay for me to turn on green. 

We are not all Dwayne from Little Miss Sunshine.  Most of us can see color and understand what it means in the traffic sense

I'm not sure what bothers me more.  Is it that the drivers of Chicago are obviously considered not smart enough to be able to understand traffic lights or that there may be people who are just that stupid and have necessitated the Chicago Traffic Control Aides? 

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