- ... that Hawaii Route 560 (pictured) was added to the National Register of Historic Places in 2004 because of its historical character of one lane bridges?
- ...that a one-mile (1.6 km) stretch of New Jersey Route 57 in Franklin Township, Warren County was the first concrete road built in New Jersey, having been constructed in 1912?
- ...that US 395 was unaffected by California's 1964 state highway renumbering, but it was later truncated due to an expansion of I-15 and I-215?
- ...that Maryland Route 577 follows the border between Caroline and Dorchester counties for its entire length?
- ...that 3 pairs of California and Nevada state highways retain the same number while crossing the state border, California State Route 28/Nevada State Route 28, California State Route 88/Nevada State Route 88 and California State Route 266/Nevada State Route 266?