California State Route 78 is a major east-west highway in southern California. It stretches approximately 90 miles, connecting the coastal city of Oceanside to Brawley in the Imperial Valley. The route passes through various landscapes, including coastal areas, deserts, and agricultural regions. The highway serves as an important corridor for both local and regional traffic. It intersects with several other major routes, such as Interstate 5 and Interstate 15, facilitating access to popular destinations like Temecula and Palm Desert. Additionally, California State Route 78 is known for its scenic views, particularly in the San Diego area.