Buses often operate in heavy traffic areas with multiple pedestian and vehicle activity, and to top this the reason they exist, the passengers, to monitor. All this while negotiating any oversized, vehicle wrapped bus through a city stopping and starting at the whim of your passengers. Cut out pointless risk and cost and eliminate blind spots, now ! Rear view camera = back in tight areas with confidence. Side view camera = don't cut off that cyclist and wait until the passengers are clear. Security camera = are those kids playing up and is that elderly passenger allright ? DVR recorder = find out the truth.