APM: 14 Location: SR 241 and Oso Pkwy, Rancho Santa Margarita SR 241 begins. APM: 14 Location: SR 241 and Oso Pkwy, Rancho Santa Margarita Reassurance shield as the freeway begins. APM: 17 Location: SR 241 and Antonio Pkwy, Rancho Santa Margarita Reassurance shield just before Antonio Pkwy. APM: 18 Location: SR 241 and Antonio Pkwy, Rancho Santa Margarita … Continue reading California State Route 241, Oso Pkwy to SR 133