This is the talk page for discussing improvements to the Four Level Interchange article. This is not a forum for general discussion of the article's subject.

Put new text under old text. Click here to start a new topic. New to Wikipedia? Welcome! Learn to edit; get help. Assume good faith Be polite and avoid personal attacks Be welcoming to newcomers Seek dispute resolution if needed Article policies Neutral point of view No original research Verifiability

Find sources:  Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL

Archives: 1Auto-archiving period: 365 days

This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

U.S. Roads: U.S. Highways / Route 66 / Junctions / California Low‑importance This article is within the scope of the U.S. Roads WikiProject, an attempt to build a comprehensive and detailed guide to state highways and other major roads in the United States. If you would like to participate, you can edit the article attached to this page, or visit the project page, where you can join the project and/or contribute to the discussion.U.S. RoadsWikipedia:WikiProject U.S. RoadsTemplate:WikiProject U.S. RoadsU.S. road transport articles Low This article has been rated as Low-importance on the project's importance scale. Topics   U.S. Highways    U.S. Route 66    U.S. road junctions   Locations   California   This article has a map. If the file has an error, please work with the Maps department to correct it. This article does not require a junction list. This article does not require a KML file.

A marker for Sam Helwer on the Redwood Highway in Northern California states:

"By the 1940's he was Project Engineer for the world's first four-level freeway interchange in Los Angeles; and became nationally recognized as State expert on freeway interchange design."

Reference http://www.hmdb.org/marker.asp?marker=1558

While this could refer to a different interchange, "world's first" should be unique. Can this be verified?

Charles Keith ( talk) 18:59, 14 June 2011 (UTC) reply