Hello, When my wife and I were in Portland several times while vacationing, the routes to and from the city were from along the edges of the shoreline along the Washington state coastline or up the California coastline, through the Oregon coast. We always took this route as it was very scenic and usually less traffic than the faster I-5 freeway up and down. But, one year, we noticed the most unusual signs along the flat roadway along the Oregon border cities. We were on highway 101 and as the road got to certain areas of flat beachfront locations, up popped these signs. At first sight, we both chuckled. Ha, a tsunami? But, as we continued to drive down the flat road southward, it looked like open season for rushing waters rolling over flat beaches, over the highway and past the communities to the far reaches of the countryside. Seaside? Well, yea! Now, when we got back to So Cal coastal area,we wondered if there were signs, too. We have lived here for so long that the communities all are so familiar and any new signs are just decorations. But, they were there… Ha! on us… As we drove to places that required us to attend or do some business, the signs were there, but for us, not so noticeable. The odd thing is, the cliff along the warning area along Dana Point is not a flat land area, but a 150 foot tall cliff that runs exactly from the first red area South to the last red cliff. So, a 150 foot tall tsunami? If one lived on either side of the tall cliffs and there was one wave rolling in, then the water would go back inland for miles until it hits the local hills and would stop. Jnaki But, where the I-5 freeway meets the harbor, is all flat land that goes 40 miles inland and is ripe for a rolling wall of water to continue up the freeway with speed. The local hills would funnel the water parallel or cover the freeway back to Santa Ana, which is 30 miles inland. Wow! Salt water on the freeways? That is a good one...YRMV If that 150 foot tall cliff on either side of the Dana Point Harbor ever gets hit with a tsunami, there will be a wall of white water rolling up the I-5 Freeway all the way to Irvine, where the old dragstrip used to be. It will also, devastate the flat Newport Beach/Huntington Beach area like a flood gate opened and everything will be underwater for miles. Yikes!