A bridge crossing a Kyoto waterway reveals a straight yellow line embedded in the cement, containing ridges that have periodic raised dots or bumps on them.
"What was it for?" we all wondered, because these lines are embedded inside the main public sidewalks of Tokyo, Kyoto, Naha - saw them where ever we went.
Finally asked a tourguide and he told us these were for the safety and guidance of blind Japanese pedestrians. The bumps in the lines are in braille. They can read them with their canes or with their feet.
Ah, so... very ingenious. Very enlightened.
Also the cross/don't cross lighted traffic signs "chirp" with tones that alert the blind walker as to the status and safety of a crossing.