APM: 27 Location: SR 73 and Bear St, Costa Mesa Overhead reassurance shield as SR 73 begins. 73 transitions to a toll road after the SR 55 interchange. APM: 26 Location: SR 73 and Costa Mesa Fwy, Costa Mesa Exit ahead for 55 south. There is no access to 55 north. APM: 26 Location: SR 73 and … Continue reading California State Route 73, I-405 to SR 55