The westernmost segment of the highway, combined with Angeles Forest Highway to/from State Route 14, is heavily travelled by southbound traffic in the morning (and corresponding northbound traffic in the afternoon) that comprises commuters who live in the Antelope Valley and work in the Greater Los Angeles Area. The route is a convenient alternative to the Antelope Valley Freeway (State Route 14) and the Golden State Freeway (Interstate 5), both located to the west, for reaching the Foothill Freeway (Interstate 210) and San Gabriel Valley. Because the road is a two-lane highway, its vehicle capacity is significantly lower than either of the two freeways.