The East Los Angeles Interchange is an interchange complex located in Boyle Heights, California, approximately 2.5 miles (4 km) east of Downtown Los Angeles. With its southern portion handling over 550,000 vehicles per day (2008 AADT), it is the busiest freeway interchange in the world. The northern portion, called the San Bernardino Split, is often considered a separate interchange. Four numbered routes converge at the interchange: Interstate 5 (I-5), I-10, U.S. Route 101 (US 101), and State Route 60 (SR 60), but the freeway segments shift alignments and directions. The interchange was named the Eugene A. Obregon Memorial Interchange, to honor U.S. Marine Corps member and Medal of Honor recipient Eugene A. Obregon. Description At the time of its construction in the early 1960s, the East Los Angeles Interchange was considered a civil engineering marvel. Located along the east bank of the Los Angeles River in the Los Angeles district of Boyle Heights, east of Downtown Los Angeles, the interchange comprises six freeway segments; that is, there are six freeway paths of travel into the complex. The actual number of numbered highways intersecting at this interchange is four: The interchange is so complex because the intersecting freeways shift alignments and directions: I-5 (originally US 101) enters the complex from the south as the Santa Ana Freeway, but exits to the north as the Golden State Freeway. The Santa Ana Freeway continues west as US 101 toward the Four Level Interchange (Bill Keene Memorial Interchange) in downtown Los Angeles. I-10 (originally US 70 "Ramona Freeway" [sic] / US 60) is not contiguous through the interchange. Heading west into the complex on the San Bernardino Freeway (I-10), the trunk road heads to US 101 at the San Bernardino Split. In order to follow the I-10 alignment, one must exit the trunk road and follow a connector that merges with the alignment of southbound I-5, then exit that trunk and follow another connector to the Santa Monica Freeway (I-10). Heading west into the complex on the Pomona Freeway (SR 60), the primary road (or trunk) heads into the Santa Monica Freeway (I-10). There is not complete freedom of movement within the interchange. Traffic flowing into it on certain freeways cannot leave it on all of the others. There is no direct connector from the westbound Pomona Freeway (SR 60) to the southbound Santa Ana Freeway (I-5) (and vice versa); travelers wanting to make