Bike riding, whether you use it to get to work here in Los Angeles or it's something you do for pleasure on the weekends, can be dangerous. Few bike riders go unscathed. Scrapes, cuts and bruises are a given. Broken bones are also common. Concussions sadly happen more often than you may expect too. Many bikers who experience the latter never seem to give themselves enough time to recuperate.
According to the director of the Colorado Concussion Clinic, many doctors will recommend that their patients allow themselves 10 days to recover from a concussion. She considers this to be absurd, especially considering how cardiac patients and those with broken bones are told to wait six weeks before returning to normal activities. She notes that brain injuries such as this shouldn't be expected to fully heal within 10 days.