The Herrero study involved known, habituated bears in an area that received 5000 visitors a day.  The Highline trail was/is the only trail there open to biking, and it directly intersects the only entry and exit corridors to the buffalo berry habitat.  The number of cars that blocked the highway are referenced to as a "wall of steel" by the Park Service, and it was preventing the bears from alternate routes.  It's disingenuous conclusion. To compare that to FNBP, which sees 250 people a day, with a different bear population and multiple entry points without resorting to anecdotal evidence as the qualifier is not the proper way to manage public lands.  Rover's Run has had very high profile maulings.  It's also had bikers and hikers on it for many years without incident.