U.S. Route 66 | U.S. Route 1 | U.S. Route 6 | U.S. Route 101 | Route 66 | U.S. Route 30 | New Jersey Route 4 | European route E65 | U.S. Route 40 | California State Route 1 | U.S. Route 1 in Maine | Pennsylvania Route 309 | European route E18 | U.S. Route 23 | European route E4 | U.S. Route 9 in New York | U.S. Route 11 | Pennsylvania Route 82 | European route E70 | U.S. Route 90 | U.S. Route 75 | U.S. Route 61 | U.S. Route 60 | Pennsylvania Route 73 | New York State Route 32 | European route E55 | U.S. Route 80 | U.S. Route 71 | U.S. Route 51 | U.S. Route 22 |
Route S4C was designated by the New Jersey Legislature in 1929 as a spur of Route 4 (now U.S. Route 9), beginning at Bennett and running south on Seashore Road and Broadway, past Sunset Boulevard to the Delaware Bay.
What is now Route 87 was initially proposed as Route S4A in 1927, a spur from Route 4 (now U.S. Route 9) in Tuckerton, Ocean County, south through Brigantine to Atlantic City.
U.S. Route 9 & New York State Route 2, Latham, New York, is a roundabout interchange with U-turn lanes for the freeway.
Some U.S. Routes are given directional suffixes to indicate a split of the main route — for instance, U.S. Route 25 splits into U.S. Route 25E (east) and U.S. Route 25W (west) between Newport, Tennessee and North Corbin, Kentucky, and U.S. Route 9W is an alternate of U.S. Route 9 between Fort Lee, New Jersey and Albany, New York.
After U.S. Route 9 and Route 4 were moved to a new routing between Freehold and Cheesequake, the former route became Route 4A, a spur of Route 4.