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. The interstate system almost always consists of multi-lane freeways and are usually traveled on more than the Routes.
Interstate Highway System
The Interstate System, named after Dwight D. Eisenhower National System of Interstate and Defense Highways, is a network of highways in the state of San Andreas that circulates the Los Santos metropolitan area before ending or merging into other roads. There are four Interstate highways: Los Santos Freeway, Del Perro Freeway, Olympic Freeway and La Puerta Freeway.
The highway names begin with an "I" prefix and then a number directly after a dash (i.e. I-4). The system exists of four highways, originally five. But, however, I-3 is absent in the game. Along with the highways, Grand Theft Auto V has the most extensive freeway system in a Grand Theft Auto game.
List of Routes
- Interstate 1 - Los Santos Freeway
- Interstate 2 - Del Perro Freeway
- Interstate 4 - Olympic Freeway
- Interstate 5 - La Puerta Freeway
Rural (US Routes)
- Route 1 - Great Ocean Highway
- Route 11 - Tongva Drive
- Route 13 - Senora Freeway
- Route 15 - Palomino Freeway
- Route 20 - Elysian Fields Freeway
- Route 68
Urban (State Routes)
- Route 14 - North Rockford Drive
- Route 16 - Mad Wayne Thunder Drive
- Route 17 - Popular Street
- Route 18 - Vinewood Boulevard
- Route 19 - Alta Street
- Route 22 - Dutch London St
- The arrangements of the number of the interstates is opposite to real-life counterparts. As for even-numbered ones, the number increases from north to south (For example, Interstate 2 is located in the north of Interstate 4), but in real-life it should be from south to north (Real-life I-8 is in the south of I-10). For odd-number ones the number goes increasing from east to west (see Interstate 1 and Interstate 5), as in real-life it will be from west to east. The rural routes is much the same, with US 68 north of US 20, and US 15 east of US 13 -- all of which opposite to real-life numbering rules. However, for state routes there is no such rules, and it's the same to the real-life California State Routes.