In the California Route Marker Program, which designates county routes in California

County routes in California

In the U.S. state of California, county routes are controlled and maintained by the respective counties in which they reside. However, they are generally patrolled by the state's California Highway Patrol....

, only two highways exist in the "R" zone: CR R2 and CR R3. Both of these routes are in Riverside County

Riverside County, California

Riverside County is a county in the U.S. state of California. One of 58 California counties, it covers in the southern part of the state, and stretches from Orange County to the Colorado River, which forms the state border with Arizona. The county derives its name from the city of Riverside,...

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R2

County Route R2 is also known as Kaiser Road. Its southern end is SR 177 and its north end is at Eagle Mountain

Eagle Mountain, California

Eagle Mountain, California is a modern day ghost town, in the Colorado Desert, in Riverside County founded in 1948 by noted industrialist Henry J. Kaiser. The town is located at the entrance of the now-defunct Eagle Mountain iron mine, once owned by the Southern Pacific Railroad, then Kaiser Steel,...

, a modern day ghost town.

The route was defined in 1964, and has not been altered since then.

R3

County Route R3 is also known by several other names along its route. Portions of the highway are called Sage Road, Cactus Valley Road, and State Street. Its southern end is SR 79

California State Route 79

State Route 79 is a state highway in the U.S. state of California. The route goes from Interstate 10 in Riverside County to Interstate 8 in San Diego County.-Route description:...

 and its north end is SR 74

California State Route 74

State Route 74 , a part of the Pines to Palms Scenic Byway, is a mostly scenic highway in the U.S. state of California. It runs from Palm Desert in Riverside County westward to San Juan Capistrano in Orange County.-Route description:...

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At its north end in Hemet

Hemet, California

Hemet is a city in the San Jacinto Valley in Riverside County, California, United States. It covers a total area of , about half of the valley, which it shares with the neighboring city of San Jacinto. The population was 78,657 at the 2010 census....

, it provides a major transportation route.

Historic information conflicts as to the date the route was defined. Some information indicates the highway was created in 1966, although other sources give a commissioning date of 1973.