Firstly, I found I reduced my "flattage" a great deal by avoiding all debris, when possible. Secondly, bike paths and bike lanes are notorious for debris because they don't have cars constantly "sweeping" them clear. Finally, any motorist who's street was as unridable as the bike path you mentioned would be up in arms.
Originally posted by rhorne
Much of my usual ride of about 25 miles is through what I consider less than desirable areas. Part is on roads and part is on a "bike path". Unfortunately most of the bike path goes through these areas. For some reason the people who live near or drive on the road that runs beside the bike path find it necessary to break their beer, wine, and coke bottles on the bike path. Some parts of it look like a war zone there is so much glass.