Interstate 205, 238 and 380 in California

California Interstate 380

Interstate 205 in California

Begin Tracy
End Banta
Length 14 mi
Length 21 km
1 → Oakland2 Mountain House Parkway

4 11th Street

6 Grant Line Road

8 Tracy Boulevard

9 MacArthur Drive

14 → Sacramento / Los Angeles

Interstate 205 or I -205 is an Interstate Highway in the US state of California. The highway is a short link between Interstate 580 and Interstate 5, about 90 kilometers east of San Francisco. The highway is important for traffic to and from northbound on I-5 toward San Jose. The highway is 21 kilometers long.

Travel directions

The highway begins as a branch of I-580 just west of Tracy, a rapidly growing city of 75,000. 2×3 lanes are available here. One passes through the north side of the town of Tracy. A little further, at the village of Banta, I-205 becomes Interstate 5 toward Stockton and Sacramento. There are no connections to the south, for this one could follow the I-580, or choose the local road network.

  • ANSWERMBA: Provides information about California history.


I-205 runs on what used to be State Route 5, which was paved in 1909, and later paved with concrete by the state of California. The Lincoln Highway auto trail ran along this route in 1913, until the Carquinez Bridge opened in 1927, and that route was led northward, via Vallejo. In 1926, the road became part of US 48, which became US 50 in the early 1930s. On November 16, 1954, the western section as far as Tracy opened to traffic as a four-lane expressway. At the time, the entire route between the Bay Area and Stockton was at least four lanes, but not yet a full-fledged highway on all routes. In November 1957 the route along Tracy was included in the plan for Interstate Highways. Construction of the highway began in the late 1960s, and it opened to traffic along its entire length on December 21, 1970. In 1999, the western portion of the highway was widened to 2×3 lanes, and the eastern portion followed in 2009, giving the entire I-205 2×3 lanes.

Traffic intensities

Exit Location 2008 2016
Exit 0 Tracy (I-580) 117.000 123.000
Exit 12 Tracy (I-5) 101.000 130.000


California Interstate 238

Get started Castro Valley
End San Leandro
Length 2 mi
Length 3 km
14 → Oakland / Stockton15 Mission Boulevard

16-17 → Oakland / San Jose

Interstate 238 or I -238 is an Interstate Highway in the US state of California. The highway forms a very short east-west link in the San Francisco Bay Area metropolitan area. I-238 is unique in that it is an auxiliary route of a non-existent Interstate, which should be I-38. The road has been given this number because it used to be State Route 238, and they preferred to keep the number. At 3 kilometers long, I-238 is one of the shortest Interstates in the United States.

Travel directions

The highway begins at the interchange with Interstate 580, which runs from Oakland toward Dublin. I-580 goes here via a TOTSO, as I-238 goes straight ahead when viewed from the east. The highway ends just down the road in San Leandro on Interstate 880, the Nimitz Freeway, which runs from Oakland to San Jose. A lot of traffic on I-238 is headed for Oakland here.


The highway was built in 1956, but did not have a number until 1964. The highway was thereafter numbered State Route 238. The highway was planned at the time to run southeast all the way to I-680 in Fremont, which is now State Route 238, parallel to I-880 (Nimitz Freeway). It wasn’t until 1983 that the highway was renumbered as I-238, simply converting the State Route number to an Interstate number, which is a violation of the numbering system. After all, there is no I-38, and if there were, it wouldn’t run in California, but rather in Arkansas or Mississippi.

Traffic intensities

Exit Location 2008 2016
Exit 14 Hayward ( I-580 ) 128,000 151,000
Exit 17 San Lorenzo ( I-880 ) 126,000 110,000

California Interstate 305

Get started sacramento
End sacramento
Length 14 km
  • sacramento

Interstate 305 is an unsigned Interstate Highway in the U.S. state of California. The track runs on Business Route 80 from Interstate 80 through the state capital Sacramento. The number is assigned by the AASHTO, but the number is not on the signage, nor is the number used internally by Caltrans. There is also uncertainty about the length. The FHWA first stated it was 8.5 miles before 1999, which marks the line between Interstate 80 and State Route 99.would mean, but after 1999 indicates that the route is 14 kilometers long, which would mean that I-305 would run up to State Route 160 north of downtown. I-305 also overlaps US 50, which begins on the west side of Sacramento at I-80, at the same point as I-305.

California Interstate 380

Get started San Bruno
End South San Francisco
Length 3 mi
Length 5 km
5 → San Jose / San Francisco5C El Camino Real

6 → San Jose / San Francisco

7 South Airport Boulevard

Interstate 380 or I -380 is an Interstate Highway in the U.S. state of California. The highway provides a very short connection between US 101 and I-280 in the San Bruno suburb, located in the San Francisco Bay Area metropolitan area. The highway is 5 kilometers long.

Travel directions

The highway begins in San Bruno, a suburb of 40,000 people located south of San Francisco. The highway starts at I-280 and runs east through San Bruno and has 2×3 lanes. Almost immediately, the highway ends again at US 101, which runs parallel to I-280 from San Jose to San Francisco.


The original plans envisioned Interstate 380 between State Route 1 (Cabrillo Freeway) and US 101 (Bayshore Freeway), forming an east-west link south of San Francisco. This highway had to be about 12 kilometers long. Only the eastern section between I-280 and US 101 was eventually constructed. The highway was opened in two phases in 1971 and 1976.

Opening history

From Unpleasant Length Date
5A 5 El Camino Real 1 km 00-00-1971
5 El Camino Real 7 2 km 00-00-1976

Traffic intensities

Exit Location 2008 2016
Exit 5 San Bruno ( I-280 ) 122,000 137,000
Exit 7 San Bruno ( U.S. 101 ) 142,000 161,000

California Interstate 380