|8070 Soquel Drive, Aptos, CA|
|Installed prior to 1969.|
Some suggest it is there because traffic flows under a railroad by changing elevation (downhill going east). There are about* six places in the county where traffic flows under the railroad.
There is a "NARROW SUBWAY" sign on Highway 129 in Santa Cruz County just before the road crosses into San Benito County.
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2012-04-13 20:51:12 Caltrans uses the term "subway" for these kinds of railroad grade separations, though maybe its usage for signs has been deprecated. The only other sign like this I can remember in NorCal—warning of the "narrow subway" as ramps from 80/580 become Ashby Ave in Berkeley—looks rather weathered. —18.104.22.168