Interstate 238: Difference between revisions

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{{short description|Interstate highway in California}}
#REDIRECT [[Interstate 238 and State Route 238 (California)]]
{{Use mdy dates|date=December 2013}}
{{seealso|California State Route 238}}
{{Infobox road
|state=CA
|type=I
|route=238
|section=538
|map={{MapframeForObjects|frame=yes|plain=yes|frame-align=center|frame-width=290|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Interstate 238}}}}
|map_custom=yes
|map_notes=I-238 highlighted in red
|length_mi=2.126
|length_round=3
|length_ref=<ref name=trucklist/>
|established=May 1983 by [[Federal Highway Administration|FHWA]]<ref name="cah Interstates">{{cite web |first= Daniel P. |last= Faigin |url= http://cahighways.org/itypes.html |work= California Highways |publisher= Self=published |title= Interstate Highway Types and the History of California's Interstates |date= December 25, 2013 |accessdate= December 25, 2013}}{{Verify credibility|failed=y|date=December 2013}}</ref>
|counties=[[Alameda County, California|Alameda]]
|direction_a=South
|terminus_a={{jct|state=CA|I|580|SR|238}} in [[Castro Valley, California|Castro Valley]]
|direction_b=North
|terminus_b={{jct|state=CA|I|880}} in [[San Leandro, California|San Leandro]]
|previous_type=SR
|previous_route=237
|next_type=SR
|next_route=238
}}

'''Interstate 238''' ('''I-238''') is an [[List of auxiliary Interstate Highways|auxiliary Interstate Highway]] in the [[San Francisco Bay Area]] in the [[U.S. state]] of [[California]]. It comprises the northernmost {{convert|2.126|mi|km}} of Route 238, as defined by the [[California Streets and Highways Code]]. Originally signed as [[California State Route 238|State Route 238]] (SR&nbsp;238) until 1983, it connects [[Interstate 580 (California)|I-580]] in [[Castro Valley, California|Castro Valley]] (where SR 238 continues south) with [[Interstate 880 (California)|I-880]] in [[San Leandro, California|San Leandro]].

The numbering of I-238 does not fit within the usual conventions of existing three-digit auxiliary Interstate Highways, where a single digit is prefixed to the two-digit number of its parent Interstate Highway. The I-238 number was specifically requested by the State of California so it could match the California Streets and Highways Code, and because at the time of the numbering all three-digit combinations of [[Interstate 80 in California|I-80]] (the primary two-digit Interstate in the Bay Area) were being used in the state.

==Route description==
Although the {{convert|2.16|mi|km|adj=mid|-long}} I-238 goes in an east–west direction from [[Castro Valley, California|Castro Valley]] to [[San Leandro, California|San Leandro]], Caltrans officially signs it as a north–south freeway since the rest of [[California State Route 238|SR&nbsp;238]] is more north–south. The southern (geographically eastern) terminus of I-238 is at its interchange with [[Interstate 580 (California)|I-580]] and SR&nbsp;238 in Castro Valley. From there, it enters into the southern portion of the [[census-designated place]] of [[Ashland, California|Ashland]], running parallel to its border with [[Cherryland, California|Cherryland]]. Then after entering San Leandro, I-238 ends at its northern (geographically western) terminus with [[Interstate 880 (California)|I-880]].

I-238 is part of the [[California Freeway and Expressway System]],<ref name="cafes">{{CAFESystem}}</ref> and is part of the [[National Highway System (United States)|National Highway System]],<ref name=fhwa-nhs>{{FHWA NHS map|region=sanfrancisco|accessdate=September 4, 2017}}</ref> a network of highways that are considered essential to the country's economy, defense, and mobility by the [[Federal Highway Administration]].<ref name=NHS-FHWA>{{FHWA NHS}}</ref> I-238 and I-880 are used as an alternate truck route between Castro Valley and [[Oakland, California|Oakland]]; trucks over {{convert|4.5|ST}} are prohibited through the latter on I-580.<ref>{{cite web |url= http://dot.ca.gov/hq/traffops/engineering/trucks/routes/restrict-hist-580.htm |title= California Interstate Route 580 Special Restriction History |publisher= California Department of Transportation | accessdate=April 7, 2011}}</ref>

===Numbering===
[[File:Interstate 238 Sign.jpg|thumb|Overhead signage along southbound I-880 marking the exit for I-238]]
The number does not follow established [[Interstate Highway System#Numbering system|rules for numbering Interstates]], as there is no I-38. As it connects two auxiliary routes of [[Interstate 80 in California|I-80]], it would normally use a three-digit number ending in 80, but of the nine possible numbers, two ([[California State Route 180|180]] and [[California State Route 480|480]]) were in use by State Routes (the latter an Interstate until 1968 though SR 480 was deleted in 1991), and the remainder were already in use by other California auxiliary routes. ([[Interstate 880 (California)|I-880]] was designated at the same time as I-238.)

==History==
{{See also|California State Route 238#History|l1=State Route 238}}
The section of road that is now I-238 had no signed number before the [[1964 state highway renumbering (California)|1964 renumbering]]; it was [[pre-1964 Legislative Route 228 (California)|pre-1964 Legislative {{nobr|Route 228}}]] (along with an unbuilt extension west to unbuilt [[California State Route 61|{{nobr|SR 61}}]], which is still included in the {{nobr|SR 238}} definition).

The segment from what is now I-580 to I-880 was built as a [[freeway]] in 1956.<ref name="bridgelog"/> The rest of SR 238 south to [[Interstate 680 (California)|I-680]] in [[Fremont, California|Fremont]] was also planned to be upgraded to a freeway (parallel to present I-880), but after it was unsuccessfully submitted to the Interstate Highway System in October 1968,<ref name="cah Interstates"/> and after several lawsuits, it was cancelled in 2003.<ref>{{cite web | first= Daniel P. |last= Faigin |url= http://cahighways.org/233-240.html#238 |work=California Highways |title= Routes 233 through 240 |publisher= Self-published |date= |accessdate=January 26, 2013}}{{verify credibility|failed=y|date= December 2013}}</ref>

When present, I-880 was added to the Interstate Highway System as a renumbering of part of [[California State Route 17|{{nobr|SR 17}}]], the short piece of {{nobr|SR 238}} connecting I-880 to I-580 was also added; both were non-chargeable routes (not eligible for Interstate Completion funds). Both numbers—I-238 and I-880—were approved by the [[American Association of State Highway and Transportation Officials]] (AASHTO) on July 7, 1983.<ref name="cah Interstates"/> The [[interchange (road)|interchange]]s with I-580 and I-880 were rebuilt from 1988 to 1994, in part to add missing ramps between I-238 and I-880 towards the south.<ref name="bridgelog"/> Prior to the completion of the ramps, access was provided by Hesperian Boulevard.

On July 7, 1983, while approving the designation, AASHTO said:
{{quote|This is to inform you that your application for the elimination of [[Interstate 180 (California)|Route 180]] and extension of {{nobr|Route 580}}, and the establishment of {{nobr|Route 880}} and {{nobr|Route 238}} have been approved.{{br}}However, since the I-238 designation does not fit the overall national numbering sequence and was necessitated only because all [[Three-digit Interstate|three [-digit] combinations]] of I-80 have been used, the Committee has a further option to offer for your consideration. If the I-580 designation [were] continued from Castro Valley to San Lorenzo and then used in place of the proposed I-880 designation northerly to Oakland and over existing I-180 between Albany and San Rafael, then existing I-580 between Castro Valley and Oakland could be designated I-180. The Committee does recognize this option would involve considerable resigning, however.}}

On July 27, 1983, Caltrans responded:
{{quote|We already have a [[California State Route 180|State {{nobr|Route 180}}]] in our Fresno area, and this route is separated from I-580 in Castro Valley by about {{convert|100|mi|km|disp=x| [|]}}. We are therefore unable to recommend the designation of existing I-580 between Castro Valley and Oakland as I-180.<ref>{{cite web |author= Casey |url= http://gbcnet.com/roads/I-238/ |title= Indigestion 238 |publisher= Casey's Roads and Highways Page |date= |accessdate= January 26, 2013}}{{verify credibility|failed=y|date=December 2013}}</ref>}}

With the decommissioning of {{nobr|SR 480}} in 1991, the "480" designation was once again made available. However, there has been no push since then to renumber I-238 to I-480.

In September 2006, a project began to reconstruct the entire length of I-238, including a reconfigured interchange with I-880 and an added travel lane in each direction. Additionally, almost all of the bridges and overpasses were replaced with new ones meeting current [[earthquake]] resistance standards. The project was completed in October 2009, six months ahead of schedule.<ref>{{cite press release |first= Phyllis |last= Moore-Lewis |url= http://dot.ca.gov/dist4/newsreleases/238rc_nr091009.pdf |format= PDF |title= Caltrans Celebrates Widening of Interstate 238 With Ribbon-Cutting Ceremony |accessdate= September 14, 2012 |date = October 29, 2009 |publisher = California Department of Transportation }}</ref>

==Exit list==
{{CAinttop|exit|based_on=the rest of [[California State Route 238|SR 238]]|county=Alameda|post_ref=<br><ref name=trucklist /><ref name=bridgelog>{{Caltrans bridgelog|date=July 2007}}</ref><ref>{{cite web |author= Staff |publisher= California Department of Transportation |url= http://traffic-counts.dot.ca.gov/ |title= All Traffic Volumes on CSHS |year= 2005–2006 |accessdate= 2015-02-01}}</ref>
|exit_ref=<br><ref>{{cite web |first= Don |last= Howe |publisher= California Department of Transportation |work= [[California Numbered Exit Uniform System]] |url= http://www.dot.ca.gov/trafficops/exit/docs/twothirtyeightnorth.pdf |title= I-238 Northbound |date= January 24, 2007}}</ref><ref>{{cite web |first= Don |last= Howe |publisher= California Department of Transportation |work= California Numbered Exit Uniform System |url= http://www.dot.ca.gov/trafficops/exit/docs/twothirtyeightsouth.pdf |title= I-238 Southbound |date= January 24, 2007}}</ref>
}}
{{CAint|exit
|location=Castro Valley
|lspan=2
|postmile=R14.47
|exit=—
|road={{Jct|state=CA|SR|238|city1=Hayward|road=Castro Valley Boulevard}}
|notes=South end of I-238; continuation beyond I-580
}}
{{CAint|exit
|postmile=R14.47
|exit=14
|road={{jct|state=CA|I|580|name1=[[MacArthur Freeway]]|city1=Oakland|city2=Stockton}}
|notes=Left southbound exit and northbound entrance; I-580 exit 34
}}
{{CAint|exit
|location=Ashland
|postmile=14.95
|exit=15
|road={{Jct|state=CA|SR|185|name1=E. 14th Street, Mission Boulevard}}
|notes=Mission Blvd. not signed on northbound I-238 despite the name change when SR 185 cross I-238
}}
{{CAint|exit
|location=San Leandro
|lspan=4
|postmile=16.70
|exit=16A
|road={{Jct|state=CA|I|880|dir1=south|name1=[[Nimitz Freeway]]|city1=San Jose|location2=[[San Mateo–Hayward Bridge|San Mateo Bridge]]}}
|notes=Northbound exit and southbound entrance; I-880 north exit 31A
}}
{{CAint|exit
|type=incomplete
|postmile=16.28
|exit=16B
|road=Hesperian Boulevard&nbsp;– [[San Lorenzo, California|San Lorenzo]]
|notes=Northbound exit and southbound entrance
}}
{{CAint|exit
|type=incomplete
|postmile=16.70
|exit=17A
|road=Washington Avenue
|notes=Northbound exit and southbound entrance
}}
{{CAint|exit
|postmile=16.70
|exit=17B
|road={{Jct|state=CA|I|880|dir1=north|name1=[[Nimitz Freeway]]|city1=Oakland}}
|notes=Northbound exit and southbound entrance; north end of I-238; I-880 south exit 31
}}
{{Jctbtm|keys=incomplete}}

==See also==
*{{portal-inline|California Roads}}
*{{Portal-inline|San Francisco Bay Area}}

==References==
{{Reflist|30em}}

==External links==
{{Attached KML|display=inline,title}}
{{commonscat}}
*[http://gbcnet.com/roads/I-238/ Indigestion 238]: A history of the route and a full explanation of its numbering
*[http://kurumi.com/roads/3di/ix38.html I-238 California]: Kurumi
*[http://www.aaroads.com/california/i-238_ca.html California @ AARoads.com - Interstate 238]
*[http://www.dot.ca.gov/hq/roadinfo/sr238 Caltrans: Route 238 highway conditions]
*[http://www.cahighways.org/233-240.html#238 California Highways: I-238]

{{I-80 aux}}
{{interstates}}
<!--putting it in this category and 3DIs because it's a special case-->

[[Category:Interstate Highway System|38-2]]
[[Category:Interstate Highways in California|38-2]]
[[Category:San Francisco Bay Area freeways|238]]
[[Category:Auxiliary Interstate Highways|38-2]]
[[Category:Roads in Alameda County, California|Interstate 38-2]]

Latest revision as of 01:26, 23 November 2021

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