California State Route 91, also known as the Riverside Freeway, is a major east-west highway in Southern California. It stretches approximately 30 miles, connecting the cities of Los Angeles and Riverside. The route serves as a vital corridor for commuters and travelers, facilitating access to various neighborhoods and attractions. The freeway begins at the interchange with Interstate 5 in Los Angeles County and ends at Interstate 215 in Riverside County. Along its path, it intersects with several other major highways, including Interstate 15 and State Route 71, making it an essential part of the regional transportation network.