I commute to work on SART everyday. In the late afternoon, between 17th street (the park and Wooden bridge) and Memorie LN, there are lots of noncyclist using the trail, joggers, families, women pushing strollers, dog walkers, These people have just as much right to the trail as cyclist do. I've witnessed groups of cyclist blazing through there at 20+mph yelling at these people. Not only is this dangerous, but gives the public a bad impression of cyclist. Being curtious goes a long way and saves lives.