U.S. Route 101
The nearly highway's northern terminus is in Tumwater, Washington: the route remains along the Olympic Peninsula's coastal perimeter west, north, and east; the northernmost point on the highway is in Port Angeles. The southern terminus of US 101 is in Los Angeles at the East Los Angeles Interchange, the world's busiest freeway interchange.
New York State Route 141
NY 141 begins at a trumpet interchange with NY 9A on the western edge of the hamlet of Hawthorne, located within the town of Mount Pleasant. This junction also serves as the south end of NY 9A's overlaps with NY 100. NY 141 initially heads to the northeast as an independent route, following the two ramps not carrying either direction of NY 100. After just , all four ramps merge into a four-lane divided highway, creating a short overlap between NY 141 and NY 100. The divided highway ends at Brighton Avenue, the first road that it intersects. NY 100 splits from NY 141 here, following Brighton Avenue southward while NY 141 heads southeastward along the two-lane Broadway, passing through a lightly developed commercial area. After one block, the route intersects Bradhurst Avenue, here a state-maintained street serving as a one-block spur of NY 100.