Metro Bus Cameras, will they enhance safety?

Metro has announced the installation of cameras on its Metrobus fleet with an eye toward enhancing the safer operation of its fleet while improving efficiency, you know saving money.

The cameras will be reportedly activated  by emergency measures undertaken by the operators including rapid acceleration or deceleration and  evasive maneuvers or crashes, which begs the question "wouldn't it be helpful to observe what led to the sudden movement or change in speed rather than the aftermath? Oh well, perhaps I misunderstand their intentions.

Union operators understandably are concerned about their privacy and whether the videotaping may give rise to other criticism. Hopefully the system can make safety routine on Metrobuses.