Having skimmed a few routes and getting frustrated by the 'show markers' function not working (hence why this isn't a more thorough review), they seem mostly fine.
One issue, however, is where (say State St on SC2) the road turns off a road onto another and you've labelled it with the road name that the highway was on, but turns off. Directional suffixes (ie StaSt_S) are surely needed as the state highway runs concurrent with the road of that name.