The original Conejo Grade was completed by the California Highway Commission in 1915 as part of the Coast Highway. The climb contained 49 curves. In 1926 the Conejo Grade/Coast Highway was desiginated US 101. In 1937 a new alignment of the grade was completed, reducing the curves by 75%. The width of the roadway was now three lanes, with a passing lane down the middle for traffic going in either direction. The present freeway, essentially a widening of the 1937 alignment, was completed by 1959 and intially consisted of six lanes. A couple on their way to Santa Barbara stands next to a sign which reads, "Summit, Conejo Grade, Curves, Drive with Care."
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