This section of road was blocked off at 6am so that old folks could do their 「ラジオ体操」, or "radio calisthenics".

Interesting tidbit (as related to me by a co-worker): Apparently one way the Japanese gub'ment could tell citizens from Korean spies was by asking them to do radio taisou. "Only a true Japanese can do radio taiso." I call shenanigans, but it's kind of funny to think about what an interrogation of that sort might entail.