{"id":"S85042377","label":"Electronic traffic controls","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85042377","normalized_label":"electronic traffic controls","broader":["http://id.loc.gov/authorities/subjects/sh85042415","http://id.loc.gov/authorities/subjects/sh85060772","http://id.loc.gov/authorities/subjects/sh85136774","http://id.loc.gov/authorities/subjects/sh85136778"],"aliases":["Traffic signs and signals, Electronic"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85042377","provider":"lcsh","revision":"36b53477a46db4b6","taxonomy_revision":"f050b5d4780b1289","title":"Electronic traffic controls","url":"/topics/S85042377","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"324272643262251588","address_version":"morton4x16-v1","coordinates":[0,20,18067,9216],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}