The system is based on the real-life numbering system in the United States, but with some differences. Rural major routes (such as Routes 1 and 13) are signed with U.S. Route shields, while minor urban routes (such as Routes 14 and 17) are marked on freeway guide signs with generic state highway markers, which are also used in real life for the state highway markers in Delaware, Iowa, Kentucky, Mississippi, and New Jersey. The interstate system almost always consists of multi-lane freeways and are usually traveled on more than the Routes.