**FILE** A couple wearing animal skins on their heads ride their Harley-Davidson motorcycle during the company's 100th Anniversary parade at the corner of Wisconsin Avenue and Milwaukee Street in this Aug. 30, 2003 file photo, in Milwaukee.Cities from New York to Denver are giving motorcyclists the silent treatment. And that worries riders rights groups, which fear that a wave of ordinances aimed at muffling Harley-Davidsons, hushing Hondas and stifling Suzukis will create a confusing patchwork of laws that motorcyclists won't be able to navigate. (AP Photo/Stephan Savoia, file)