The Cook County Highway Department is often quoted to have said "the road must have five lanes". We have only heard them say that the road "qualifies" for five lanes.
We also always hear that Quentin Road is a "Strategic Regional Arterial (SRA)" and that is why it needs to have five lanes. While Quentin Road is indeed listed as SRA#414 by the Chicago Metropolitan Agency for Planning (CMAP, a regional traffic plan for the route has never been finished or approved or published (see CMAP's SRA Resources Page. And then, series 400 SRAs such as Quentin Road are only minor SRAs and are not subject to the same requirements major series 100, 200, or 300 SRAs are.
This work group focuses on debunking the "five lane myth" and to assemble as much evidence as possible, that a three-lane approach is feasible for Quentin Road. Highway departments all over the country reduce lane count, they successfully operate high-volume three-lane roads, and the 2010 Edition of the Highway Capacity Manual has ben updated to better reflect the actual capacity of roads such as Quentin Road.