Interstate 780
Interstate highway in California
Interstate 780 (I-780) is an east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from the intersection of Curtola Parkway and Lemon Street in Vallejo east to I-680 just north of the Benicia–Martinez Bridge in Benicia. It closely parallels the Carquinez Strait for its entire route. Originally, this segment was part of I-680 before that Interstate was extended and rerouted to Fairfield. The city-maintained Curtola Parkway continues west to State Route 29 (SR 29) in Vallejo.
Route description
The entirety of I-780 is defined in section 623 of the California Streets and Highways Code as Route 780, and that the highway is from "Route 680 at Benicia to Route 80 in Vallejo". This definition roughly corresponds with the Federal Highway Administration (FHWA)'s route logs of I-780.
The I-780 state-maintained freeway actually begins at Lemon Street and Curtola Parkway, quickly crossing underneath I-80 at a cloverleaf interchange. The freeway passes through parts of unincorporated Solano County, then heads southeast along the Benicia State Recreation Area (a marsh). It then bypasses downtown Benicia through the hills to the north.
Begin with the source’s own compact description: “Interstate 780” is interstate highway in California. The dossier treats that line as a proposition to test through Interstate, highway and California, not as a finished interpretation.
Why this record matters
The phrase “interstate highway in California” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Aug 25, 2025. The linked authority identifier is Q400010. Authority coordinates are 38.058, -122.150. 2 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Interstate 780” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.