Interstate 110 and California State Route 110

Route 110 is a busy road system in the Los Angeles metropolitan area in California. It helps connect many important places, starting from San Pedro and the Port of Los Angeles all the way up to Downtown Los Angeles and Pasadena. The southern part of this route, from San Pedro to I-10 in downtown Los Angeles, is called Interstate 110, or I-110. The northern part, going to Pasadena, is known as State Route 110, or SR 110.

The whole length of I-110, and the part of SR 110 south of the Four Level Interchange with US Route 101, is called the Harbor Freeway. North of US 101 to Pasadena, SR 110 is named the Arroyo Seco Parkway. This is special because it was the first freeway built in the western United States. This road system is very important for moving people and goods in the busy area of Los Angeles.

Route description

Route 110 is a major highway in the Los Angeles area. It starts in San Pedro and goes north to Pasadena. The southern part, from San Pedro to Downtown Los Angeles, is called Interstate 110 (I-110). The northern part, going to Pasadena, is called State Route 110 (SR 110).

The Harbor Freeway, which is I-110, begins in San Pedro and heads north to meet the Santa Monica Freeway (I-10). After I-10, it becomes SR 110 and continues through Downtown Los Angeles to US 101. The Harbor Freeway is very busy, especially during rush hour, and helps carry traffic from the Port of Los Angeles to other parts of the city.

The Arroyo Seco Parkway is SR 110’s part from US 101 to Pasadena. It goes through parks and crosses rivers before reaching Pasadena.

Harbor Transitway

The Harbor Transitway is a special road for buses and cars with more people inside, running along the middle of Interstate 110 between the Gardena Freeway and Adams Boulevard in Los Angeles.

As of January 2026, these special lanes are open all day and night. Drivers alone pay a fee based on traffic, but cars with two or more people and motorcycles do not pay. Everyone needs a special electronic tag to use these lanes, and drivers without one will have to pay extra.

History

See also: Interstate 110 (California 1958–1968)

In 1924, a plan was made to widen Figueroa Street to connect San Pedro and the Port of Los Angeles. In 1933, this road was added to the state highway system as Route 165, stretching from San Pedro through Figueroa Street Tunnels to Route 9, now I-210. By 1934, it became Sign Route 11. In 1941, the Arroyo Seco Parkway opened, offering a faster route to Pasadena.

The Harbor Freeway started opening in 1952, growing slowly southwards. It reached Pacific Coast Highway (SR 1) in 1962 and finished in 1970 with the Vincent Thomas Bridge. In 1981, Route 11 became I-110 on the Harbor Freeway and SR 110 on the Pasadena Freeway.

Preservation

Even though there is more traffic in Los Angeles, including trucks moving goods from the Port of Los Angeles in San Pedro, there are no plans to change Interstate 110 from I-10 to Pasadena to meet higher standards. Instead, Caltrans wants to protect the Arroyo Seco Parkway as a special historic place. In 1993, the state legislature named the original part of the parkway, north of the Figueroa Street Viaduct, a "California Historic Parkway." This means it is part of the State Scenic Highway System for freeways built before 1945. The only other highway with this honor is the Cabrillo Freeway (SR 163) in San Diego. In 1999, the American Society of Civil Engineers called it a National Historic Civil Engineering Landmark, and in 2002, it became a National Scenic Byway.

Exit list

The entire route of Interstate 110 and California State Route 110 is located in Los Angeles County.

Location	mi	km	Exit	Destinations
San Pedro	0.93	1.50		Gaffey Street – San Pedro
			1A	SR 47 (Vincent Thomas Bridge) – Terminal Island, Long Beach
	1.23	1.98	1B	Channel Street / Pacific Avenue
	2.77	4.46	3A	Harry Bridges Boulevard
Wilmington	3.26	5.25	3B	Anaheim Street
Wilmington–Harbor City line	4.06	6.53	4	SR 1 (Pacific Coast Highway) – Torrance, Beach Cities
West Carson–Carson line	5.45	8.77	5	Sepulveda Boulevard
	6.52	10.49	7A	223rd Street
	7.02	11.30	7B	Carson Street
	7.74	12.46	8	Torrance Boulevard
Carson–Los Angeles line	8.78– 9.07	14.13– 14.60	9	I-405 (San Diego Freeway) / 190th Street – Santa Monica, Long Beach
Los Angeles	9.87	15.88	10A	SR 91 east (Gardena Freeway)
	9.87	15.88	10B	SR 91 west (Gardena Freeway)
			—	I-110 Express Lanes
			—	Harbor Gateway Transit Center
			—	Alondra Boulevard
	11.24	18.09	11	Redondo Beach Boulevard
	11.89	19.14	12	Rosecrans Avenue
	12.90	20.76	13	El Segundo Boulevard
	13.82	22.24	14A	I-105 east (Glenn Anderson Freeway) – Norwalk
	13.85	22.29	14B	I-105 west (Glenn Anderson Freeway) – LAX Airport
			—	I-105 east
	13.97	22.48	14B	Imperial Highway
			—	I-105 west – LAX Airport
	14.97	24.09	15	Century Boulevard
	15.98	25.72	16	Manchester Avenue
	16.98	27.33	17	Florence Avenue
	17.51	28.18	18A	Gage Avenue
	17.98	28.94	18B	Slauson Avenue
	18.50	29.77	19A	51st Street
	19.00	30.58	19B	Vernon Avenue
	19.50	31.38	20A	Martin Luther King Jr. Boulevard – Los Angeles Memorial Coliseum, Exposition Park, Banc of California Stadium
			—	39th Street – Coliseum
	20.00	32.19	20B	37th Street / Exposition Boulevard
			—	I-110 Express Lanes
			—	Adams Boulevard / Figueroa Street
	20.71	33.33	20C	Adams Boulevard
	21.44	34.50	21	I-10 (Santa Monica Freeway) – Santa Monica, San Bernardino
	21.76– 22.12	35.02– 35.60	22A	Pico Boulevard / Olympic Boulevard – Downtown Los Angeles
	22.36	35.98	22B	James M. Wood Boulevard / 9th Street / 8th Street
	22.83	36.74	23A	6th Street / Wilshire Boulevard
	23.04	37.08	23B	4th Street
			23C	3rd Street
	23.73	38.19	24A	US 101 south to I-5 south (Santa Ana Freeway) / I-10 east (San Bernardino Freeway) / SR 60 east (Pomona Freeway)
	23.73	38.19		US 101 north (Hollywood Freeway) – Ventura
	23.96	38.56	24B	Sunset Boulevard
	24.55	39.51	24C	Hill Street – Chinatown, Civic Center
	24.73	39.80	24D	Stadium Way – Dodger Stadium
	24.90	40.07	Figueroa Street Tunnel No. 1; northbound only
	25.04	40.30	25	Solano Avenue / Academy Road
	25.14– 25.37	40.46– 40.83	Figueroa Street Tunnels No. 2-4; northbound only
	25.48	41.01	26A	I-5 north (Golden State Freeway) – Sacramento
	25.78	41.49	26B	Figueroa Street
	25.91	41.70	26A	Avenue 26
	26.12	42.04	26B	I-5 (Golden State Freeway) – Santa Ana, Sacramento
	27.12	43.65	27	Avenue 43
	28.05	45.14	28A	Avenue 52
	28.38	45.67	28B	Via Marisol
	28.76	46.28	29	Avenue 60
	29.28	47.12	30A	Marmion Way / Avenue 64
	29.50	47.48	30	York Boulevard
	30.10	48.44	30B	Bridewell Street
South Pasadena	30.59	49.23	31A	Orange Grove Avenue
South Pasadena–Pasadena line	31.17	50.16	31B	Fair Oaks Avenue
Pasadena	31.91	51.35		Glenarm Street – Light Rail
				Arroyo Parkway – Light Rail, Rose Bowl, Huntington Library
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Closed/former       Electronic toll collection       Incomplete access       Route transition