Talk:Four Level Interchange
Latest comment: 13 years ago by Charles Keith in topic Project Engineer?
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Project Engineer?
editA 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?