It looks like you can see I-80 going through Nevada and I 15, going from CA to Utah, following the dots.
What’s interesting about that “map” is you can clearly see the routing of Interstate route 5, 80, 15 and 84 across the western states. And you can see the “split” of Interstate 5 and California 99 between Sacramento, CA and the merge between I-5/CA 99 just north of Wheeler Ridge, CA.