AMP: Swift Hwy #120/2 Location: Marine Dr and I-5, Portland No reassurance shield as Oregon 120 begins. AMP: N/A Location: Marine Dr and Portland Rd, Portland Less than a mile later, state maintenance ends, making this an unsigned non-state maintained state route, which is pointless. That said, this sign says to stay straight for T5 and T6. … Continue reading Oregon Route 120, I-5/OR 99E to Columbia Blvd