Hello, I left a comment on your previous changeset explaining that the expressway=* tag is used to specify whether a road is an expressway or not, and that this section has expressway=yes added to it. This does not yet render on OSM Carto (which is used as the standard layer for OSM) but does for some other highway-centric map styles.

The indication that this is a bypass/alt route of the I 66 tolls is that the trunk route begins at the ramps connecting to I 495 rather than past them. The freeway-like segment of US 50 to the west of these ramps serves the same purpose as what it does up to I 66 by Fairfax.