I like the spiral ramps on this POC, although I'm surprised there is sufficient headroom for an adult. I noticed that they also provide a regular sloping ramp on one side of the road. Maybe they didn't have room to provide a sloping ramp on the other side? I also wonder if the columns for the spiral ramps are hollow and if they have a roof?
I remember there was a POC with spiral ramps near the beach in Santa Monica that was closed because of concerns how it would perform during an earthquake. However, this POC seems to be a more modest structure and the central column probably provides more stability.
Chilean Bridges: Concepcion POC w/ Spiral Ramps by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.