Bart Thielges: "In the 1980s the CSAA [California State Automobile Association] dropped the documentation of pedestrian overcrossings (POCs) from their city street maps. When brought this up with one of the cartographers in the San Francisco office, he told me that this was a new CSAA policy, not a mistake. Fortunately POCs are beginning to reappear in CSAA maps printed in 2000 and later."
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