SSH 1P was added to the state highway system in 1937. This route began at Jct PSH 1 (US 99) in Toledo and headed southwesterly via Vader, ending at Ryderwood. Although US 99 was moved from its route through Toledo to the present route of I-5 west of Toledo in the mid 1950s, it was not until 1963 that the eastern terminus of SSH 1P was shifted from Toledo to I-5 Exit 60 west of Toledo. Today, SSH 1P is SR 506.
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