Presentation on the proposed reconfiguration of Western near Belmont:
http://www.cityofchicago.org/content/dam/city/depts/cdot/Western_Ave_meeting_exhibits_July2010.pdf
In short, demolishing the overpass and widening Western to 3 full lanes in each direction, with the outer lanes being parallel parking during the off-peak. This means narrowing Western's sidewalks from 15 feet to 13 feet, aside from at the overpass where the sidewalks are only 9 feet presently.
My main concerns are (1) will the widening just squeeze the traffic balloon and shift the congestion hotspots, thereby creating demand for future widening projects elsewhere on Western? Full modeling of the corridor should reveal changes in LOS at outlying intersections, particularly Western/Fullerton and Western/Irving Park; (2) what hypothetical future Bus Rapid Transit options will this project preclude from happening? If the street gets yet another planted median, there goes any hope of a center-running BRT with prepaid boarding islands. On the other hand, if the new outer lanes are at least made bus-and-right-turn-only and bus stops are placed strategically at intersections, this project could improve the reliability and speed of bus service.
I'm also a bit skeptical of some of the pedestrian crossing distances at the big intersections, but Western is already utterly hostile to pedestrians in geometry, traffic, and land use, so at most it's a missed opportunity rather than worsening the status quo in this regard.