SitOrSquat is for local restrooms, requires a facebook id, and an iPhone (even worse ), and I've never seen a satisfied user. I think building a restroom finder (with reviews) into an app that already knows gas stations, and already knows the route you're taking so it won't tell you about supermarkets in between exits that are 10 miles apart, is a great idea.
Area manager, various parts of New York State ... and the "v" is for Volvo.