We were in DV a few years ago for the ranger-led Paleontology hike. There was a concurrent bicycle ride. Traffic on Badwater Road both to and from the hike start was a mess. The road has many blind curves where it is impossible to pass without pulling into the oncoming lane. Some riders were two abreast making matters worse. I now plan our DV trips by checking bike ride schedules and avoiding them. I applaud park efforts to restrict these events. By the way, California has a new law requiring three feet of clearance when passing a bicycle. Since the paved roads in DV belong to the state, maybe that law had something to do with the park's decision.