Washington State Route 5, commonly known as I-5, is a major interstate highway that runs through the western part of the state of Washington. It stretches approximately 276 miles from the Canadian border in the north to the Oregon border in the south, connecting key cities such as Seattle, Tacoma, and Vancouver. I-5 serves as a vital transportation corridor for both local and interstate travel. It facilitates the movement of goods and people, playing a crucial role in the economy of the region. The highway is also known for its scenic views, particularly as it passes through areas like Mount Rainier National Park.