State Route 110, also known as the Pasadena Freeway, is a major highway in California. It connects the city of Pasadena to downtown Los Angeles, providing a vital link for commuters and travelers. The route is approximately 11 miles long and is known for its scenic views, particularly as it passes through the San Gabriel Valley. Originally opened in 1940, State Route 110 is one of the oldest freeways in the Los Angeles area. It serves as a key corridor for local traffic and is part of the larger California state highway system, which includes other important routes like Interstate 5 and State Route 134.