(To see the most detail in this image, click on it to enlarge it!)
We were in San Francisco this past weekend to see Rachel (and go to a winning SF Giants baseball game). On Saturday, there was an Art Walk in North Beach and we spent a few hours walking there, drinking coffee and eating Italian goodies. As we walked, a group of about 10 people on Segways silently rode by while on a tour of San Francisco. The tour guide was in the front Segway and appeared to be speaking into a microphone. So there must have been a wireless communication system and the tourists appeared to have earphones.
It looked like a lot of fun. Be sure to click on the picture above to enlarge it for a better view.