California State Route 15, also known as I-15, is a major highway that runs through the southern part of California. It stretches approximately 286 miles, connecting the city of San Diego to the Nevada border. This route is essential for both local and long-distance travel, facilitating access to various cities and attractions along the way. The highway passes through diverse landscapes, including deserts and mountains, and serves as a vital corridor for commerce and tourism. Key points of interest along SR 15 include Temecula, known for its wineries, and Barstow, a hub for travelers heading to Las Vegas.