Interstate 15 (I-15) is a major highway in the United States that runs north-south. It stretches approximately 1,433 miles, starting in San Diego, California and ending in Montana. I-15 connects several key cities, including Los Angeles, Las Vegas, and Salt Lake City, making it an important route for both commercial and recreational travel. The highway passes through diverse landscapes, including deserts, mountains, and urban areas. It serves as a vital corridor for trade and tourism, facilitating access to popular destinations like Zion National Park and Lake Tahoe. I-15 is also known for its scenic views, particularly in Southern California and Nevada.