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There is a tunnel near the top of the Niraikanai bridge, and the top of the tunnel is the observatory. There is a parking space at the observatory, but you can not park the car because there is bollard on the side road.
We passed by the bridge several times as we spent a day exploring Nanjo. The bridge is very close to Cafe Kurukuma and the drive down the coast offers you a very picturesque view of the ocean. Road is smooth with minimal traffic.
This bridge is on the main highway that goes along the coast of Nanjo. The entire highway makes for a nice drive up or down the coast, and I'd recommending taking this route if you are going there anyway.