Unsigned Highway - Examples of Major Unsigned Highways

Examples of Major Unsigned Highways

• In several cities in the United States a short connector freeway is assigned a number in the Interstate Highway System; however, the freeway also carries one or more longer highway designations through the downtown area. In some cases, the freeway is only signed as one of the through designations and the short Interstate designation is omitted. Examples include Interstate 444, Interstate 345, Interstate 305 and Interstate 595, all of which are signed only with the U.S. Highway designations.
• The Interstate Highway System includes highways outside the Contiguous United States. While the interstate highways in Hawaii are signed similar to those in the contiguous United states, those in Alaska and Puerto Rico are not signed with Interstate highway shields.
• Interstate 4 is internally designated by the Florida Department of Transportation as State Road 400; however, the state designation continues after I-4 has ended, and SR 400 signs do exist on the portion beyond the termini of I-4.
• Many named toll roads, turnpikes and parkways in the eastern United States are assigned route numbers by the owning agency, but are only publicly signed with a name. Examples include Florida's Turnpike (officially State Road 91), the Garden State Parkway (officially Route 444), the southern portion of the New Jersey Turnpike (officially Route 700), and the Atlantic City–Brigantine Connector, a spur off the Atlantic City Expressway, officially numbered Route 446X and Route 446 respectively.
• The East Los Angeles Interchange is a case where a highway is unsigned with a conflict between the state and federal definition of a highway. The state definition of Interstate 10 has a discontinuity with a stub freeway proceeding west from the northern part of this interchange towards U.S. Route 101, while the federal definition of I-10 is contiguous. The discrepancy is resolved by having the signage at the interchange imply I-10 proceeds south through the main portion of interchange concurrent with I-5. The I-10 stub is signed US 101 while driving west and I-5/10 driving east.
• An unusual case is Washington State Route 41, which is the unsigned designation for a brief portion of Idaho State Highway 41 that crosses the state line. Wyoming Highway 70 also dips into an adjacent state without any signage from the other state; however, in this case the road is entirely maintained by a single department of Transportation and does not have a Colorado highway designation.
• U. S. Route 77 through Dallas County, Texas, is concurrent with Interstate 35E and is not signed there. Also, TxDOT does not sign U. S. Route 67 where it is concurrent with Interstate 30 in Dallas and Rockwall counties.