It isn't just spur roads that KDOT is looking to unload, according to the Lawrence Journal-World
http://www2.ljworld.com/weblogs/town_talk/2013/jun/25/city-considering-35-million-swap-with-kd/
http://www2.ljworld.com/news/2013/jul/03/editorial-street-swap/
Basically, KDOT's looking to drop the US 40 designation from 6th Street west of Iowa. According to Chad Lawhorn of the J-W, KDOT would route 40 along K-10 around the west side of town, then back north on 59 to 6th and Iowa [6th Street east of Iowa would remain a City Connection Link designated US 40 and US 59]
Granted, US 40 doesn't have to have effective continuity these days, not being the main route of travel through the area... but, what the hell? They want to take a 4 mile stretch and extend it to 10.4 miles? I mean, yes, it would go along a route they are already responsible for, and so they save $$$, but it seems insane in terms of driveability.
Maybe AASHTO will do something useful and disapprove the relocation due to the increase distance.
IMHO, if KDOT wants to turn over 6th Street so badly, they should relocate US 40 by signing US 40 along US 24 (as suggested in the Lawrence newspaper article comments ) from US 59 to somewhere around Topeka, possibly using K-4 to I-70.
This (KDOT's idea, I mean) would make sense if the time savings from the lack of traffic signals on that segment of K-10 (there's only one, currently), the reduced number of intersections, and the higher speed limit would cancel out the increased distance of a trip following US 40,
but the segment of US 59 between K-10 West and US 40 is almost exactly as long as the segment of US 40 that is proposed to be replaced (and it's even slower, from my experience driving it).
So, unless the travel time used for following US 40 under the proposed re-routing is equal to or less than what it is now (which I doubt, but I'd love to see an estimate somewhere), then I don't see what justifies this, unless maintenance costs to the state really
are the most important consideration, in which case, why don't we just eliminate the U.S. Highway system altogether already, if it's that meaningless?