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Santa Susana Mountain ridge in process of being cut through to transform Newhall Tunnel into an open cut highway.

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Modern 4-lane section of Newhall Tunnel highway has a raised central dividing strip covered with plant-mixed surfacing.

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Typical Slip-Out during heavy storm on Topanga Canyon Route Near Santa Monica in Los Angeles county.

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Narrow Newhall Tunnel bottleneck on State Highway 23 as it appeared before excavating of cut slopes as indicated by dotted lines.

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New 4-lane divided highway unit of State Route 23 eliminating Newhall Tunnel in Los Angeles County.

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Washout north of Ojai on the Ventura-Maricopa Highway in Ventura County during the storm of 1938.

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Slide on Ridge Route, Los Angeles County, in 1938 storm.

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Large slide on Coast Route, north of Santa Monica, Los Angeles County.

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Six-lane free-way with 11-foot asphalt concrete, portland cement concrete, and plant-mix pavement strips on Arroyo Seco Parkway between Los Angeles and Pasadena.

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New type six-cylinder Diesel tractor pulling 15-cubic yard scraper on Roosevelt Highway construction.

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View of construction activities at summit cut between Latigo and Escondido Canyon.

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Menacing sandbar was forming between the stranded “Minnie A. Caine” and shore when this picture was taken.

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All that remained of the stranded “Minnie A. Caine” after burning.

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While the stranded ship “Minnie A. Caine” was forming sand bar, tidal currents threatened the PCH.

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This photograph shows a completed section of slide prevention work near Santa Monica where retaining wall prevents slides from blocking State Highway seen at base of unstable cliff. Highway traffic was endangered by these Palisades.

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Clearing summit of Santa Monica Palisades of dangerous slide material.

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View of Cahuenga Freeway with 8 traffic lanes divided by Pacific Electric tracks. Looking North from Cahuenga-Highland intersection showing Pilgrimage Play bridge in background and subway underpass to Cahuenga Avenue.

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View of Cahuenga Freeway with 8 traffic lanes divided by Pacific Electric tracks. Looking North from Pilgrimage Bridge. Note entrances to service roads on right and left with intersectional islands.

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View of Pacific Coast Highway tunnel, ramps and overhead grade separation structure at Colorado Avenue intersection in Santa Monica.

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Overhead structure across 4-lane PCH at Santa Monica.

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View of Cahuenga Freeway looking southeasterly, showing underpass beneath Pacific Electric tracks at intersection of Highland and Cahuenga avenues.

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Sketch of grade separation at Santa Monica involving a tunnel, overhead structure crossing three highways and a wide promenade.

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Tunnel and ramps at PCH intersection with Appian Way.