APM: 21 Location: SR 173 and SR 189, Lake Arrowhead, San Bernardino Cty No reassurance shield after the 189 junction. APM: 21 Location: SR 173 and Rainbow Dr, Lake Arrowhead, San Bernardino Cty Reassurance shield as we head out of Lake Arrowhead. APM: 23 Location: SR 173 and SR 18, San Bernardino Cty Shortly thereafter we’ll approach SR … Continue reading California State Route 173, SR 189 to SR 18