California State Route 71
California State Route 71, also known as the Corona Expressway, runs from Route 91 near the Santa Ana River to Route 57 at the Kellogg Hill Interchange with Route 10. The route cuts through the unusual "tail" of San Bernardino County, which connects it to Orange County.
State Law
Legal Definition of Route 71
Route 71 is from Route 210 to Route 91 via Pomona and Chino Hills.
Note: "Route 210" should really be "Route 57".
Source: California Streets and Highways Code, Chapter 2, Article 3, Section 371
Freeway and Expressway System
Entire route.
Source: California Streets and Highways Code, Chapter 2, Article 2, Section 253.1
Scenic Highway
The state scenic highway system shall also include:[...] Route 71 from Route 91 near Corona to Route 83 north of Corona.
Source: California Streets and Highways Code, Chapter 2, Article 2.5, Section 263.4