I think the city does have some things in the works. I remember they did a big traffic study about a year ago. Of course, change takes time. I would contact your alderman and ask what's going on. Also, the Traffic & Parking dept has monthly meetings that you can attend and get on the agenda.

As far as the yellow line goes, I live on Kidder and I think the yellow line makes cars drive faster. It seems to be some visual cue that it's a raceway.

I remember hearing about someone in another town that wrapped a hairdryer in duct tape, and stood on the street pointing it at speeding cars. Everyone slowed down because they thought it was a speed trap. Not a long term solution, but it could be fun.