Interstate 238: Difference between revisions

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#REDIRECT [[Interstate 238 and State Route 238 (California)]]
{{Use mdy dates|date=December 2013}}
{{distinguish|California State Route 238}}
{{Infobox road
|state=CA
|type=I
|route=238
|section=538
|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 a short auxiliary route of the [[Interstate Highway System]] in the [[San Francisco Bay Area]] in the U.S. state of California. It comprises the northernmost 2.126 miles 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]].

This route is part of the [[California Freeway and Expressway System]].<ref name="cafes">{{cite web |url= http://leginfo.ca.gov/cgi-bin/displaycode?section=shc&group=00001-01000&file=250-257 |work= Streets and Highways Code |title= Section 250–257 |publisher= Legislative Counsel of California |author= California Assembly |accessdate=January 26, 2013}}</ref>

==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 south (or east) 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 terminates at [[Interstate 880|I-880]].

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), and the remainder were already in use by other California auxiliary routes. ([[Interstate 880|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 never got off the ground.<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]

{{3di|80}}
{{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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