Yes, that's it Bob, well, close anyway. The one I saw looked like a very crude version of that and I'm thinking that it didn't have the extra wheel on the side. More like just a plank of wood attached for a seat. The one in your photo looks very well made - the one I saw was most certainly not.
Very practical for sure, but in heavy traffic zipping between cars and trucks it was a bit frightening to watch.
Love your photos and all of the contributors to this thread.