Texas Subcategories This category has the following 6 subcategories, out of 6 total. + Highways in insular areas of the United States (3 C, 2 P)C California highways (5 C, 1 P)G Highways in Guam (1 C, 19 P)N New Hampshire highways (1 C, 9 P)U Highways in the United States Virgin Islands (34 P)W Routes in Washington, D.C. (4 P)