Altadena Drive is one of the major east-west roadways in Altadena, California, stretching almost continuously from one end of the town to the other. The road is actually a convergence of several smaller roads which were established over the half century of a growing Altadena community. It begins at a cul-de-sac at the Arroyo Seco, the west-most boundary of Altadena, and runs due east as West Altadena Drive to Fair Oaks Avenue where it becomes East Altadena Drive. At Mendocino Lane it becomes North Altadena Drive which continues into Pasadena to Colorado Boulevard where it becomes South Altadena Drive. The road does not come to any terminus, but its name changes to Santa Anita Avenue (see history section below) and carries into San Marino.