Auxiliary route

See Also:List of Auxiliary Interstate Highways

An auxiliary route is a three-digit highway that usually is connected to or diverted from a parent highway, though they do not need to (for example, US 421 is not connected to US 21).

Highway Shield

Interstate 295 is an auxiliary route of Interstate 95.

• The shield on the right is an example of an auxiliary Interstate Highway. The shield is wider than a typical interstate shield. (1st photo)

• This photo is a comparison between a primary interstate shield (I-95) and an auxiliary interstate shield (I-295)
• The second highway shield is an example of a US auxiliary route. The shield is typically wider than primary US highways (excluding US 101)