By Expressway I mean what "road geeks" call Freeway. They are for the non-Interstate highways that are fully-controlled access (no traffic lights or intersections, no driveways) that are up to interstate standards* or otherwise. Here are some examples.
Route US 1, no tolls.
Various sections in New England,
the Northeast, North Carolina and Florida.
Where Route US 1 is a toll road:
Tobin Bridge, Boston; GWB Bridge, New York;
and Delaware River Bridge, Trenton NJ - Morrisville PA.
Route US 19 in Pinellas County, Florida,
and in Metro-North Atlanta, Georgia.
Route US 93 in Vegas.
Route US 101 in California.
Bud Schuster Freeway in PA.
* Interstate standards: 12-foot travel lanes, a full 10-foot right hand breakdown lane, full left hand breakdown land for highways three travel lanes or more in one direction, 16'-6" clearance underneath the overhead bridges (overcrossings and sign bridges), no more than 6 percent grade..