Talk:Four Level Interchange

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U.S. Roads: U.S. Highways / Route 66 / Junctions / California Low‑importance

	U.S. roads portal 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
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Project Engineer?

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]