One of my main in-town commuting bikes during the '90s was an upside-down bike. I took the more upright approach of having extensions for the seat and handlebars welded on by the builder. The builder was none other than Peter Wagner of Whymcycle fame. Like most of his creations, the upside-down bike came out of a dumpster.

If bike safety is a matter of being noticed by the motorists, this was one of the safest bikes I ever rode.