Colorado Boulevard (or Colorado Street) is a major east–west street in Southern California. It runs from Griffith Park in Los Angeles east through Glendale, the Eagle Rock section of Los Angeles, Pasadena, and Arcadia, ending in Monrovia. The full route was once various state highways but is now locally maintained in favor of the parallel Ventura Freeway (CA-134) and Foothill Freeway (I-210). The most original portion of Colorado Boulevard ran from Orange Grove Boulevard to Broadway, now Arroyo Parkway. This portion of the street always contained many shops, banks, hotels, and major commercial industries. By the late 19th century, this part of Colorado had become so popular, it was becoming a traffic bottleneck, and as early as May 1900 there were public outcries to the City Council to widen the road. It wasn't until 1929 that the City undertook the major and unprecedented task of cutting back the buildings along Colorado 14 feet (4.3 m) on each side. This undertaking created a monumental amount of legal red tape as well as many engineering dilemmas which were handled with amazing results.
(text from Wikipedia)