Some may be too short or unimportant.
AZ Fain Road (Prescott Valley)
AZ Northern Parkway
CA 10 (SBD Freeway stub west of I-5)
CA 259
CA 710 (Pasadena stub)
CA Alfred Harrell Highway
CA Colorado Freeway (old 134 east of I-5)
CA Golden State Boulevard (Fresno)
CA Jamboree Road
CA La Jolla Parkway
CA Long Beach connections to I-710
CA Pacific Highway (San Diego)
CO 6th Avenue (Denver)
CO Academy Boulevard (Colorado Springs)
CT Bradley International Airport Connector
CT Whitehead Highway (Hartford)
DC 9th and 12th Street Tunnels
DC E Street Expressway
DC East Capitol Street
DC North Capitol Street
DC South Capitol Street
FL 139 (Mathews Expressway, Jacksonville)
FL CR 296 and CR 611 (Pinellas County)
FL Disney World freeways
FL I-4/Selmon Expressway Connector (Tampa)
FL Nocatee Parkway
GA Lindsey Creek Parkway (I-185 extension)
GA Sugarloaf Parkway
IL Lake Shore Drive north of US 41
IL Stony Island Avenue
KS Woodie Seat Freeway (Hutchinson)
MA Plimoth Plantation Highway
MD Moravia Road (Baltimore)
MD Sam Eig Highway
MI Mound Road
MO Forest Park Parkway
NC Aviation Parkway (Raleigh-Durham)
NC Bryan Boulevard (Greensboro)
ND 810 (Bismarck Expressway)
NE Storz Expressway
NH Raymond Wieczorek Drive
NJ 76C
NV 171
NY 984J (connects I-684 to HRP)
NY Adirondack Northway (south of I-90)
NY Central Westchester Parkway
NY CR 97 and CR 99 (Suffolk County)
NY Inner Loop (Rochester)
NY JFK Expressway (Queens)
NY South Mall Arterial (Albany)
NY West Street (Syracuse)
OK Chickasaw Turnpike
OK LL Tisdale Parkway
PA Highland Park Bridge
RI Airport Connector
RI Henderson Bridge
TN 300 (currently part of Future I-69)
TN Plough Boulevard
TX FM 1764
TX PA 1502 (Wurzbach Parkway)
TX PR 22 (Padre Island)
WA Evergreen Parkway (Olympia)
Related:
http://travelmapping.net/hb/?r=tx.sp0097 should probably be moved to usasf as IntPkwy. Most of it is not Spur 97, and I don't think it's signed.
http://travelmapping.net/hb/?r=in.samjonexpy has a hanging west end.