What are the four danger zones around a school bus and why is the right-side zone considered most dangerous?

THE FOUR DANGER ZONES create a ring of risk around the school bus that the driver must actively manage every time students are loading or unloading. FRONT ZONE: Extends approximately 10 feet from the front bumper; students crossing cannot be seen if within this zone; the front crossing arm helps but cannot fully substitute for distance; LEFT (DRIVER SIDE) ZONE: Extends alongside the driver's side; traffic in this lane is the risk for students exiting on the right who must cross; the driver monitors oncoming traffic in this zone; RIGHT (PASSENGER SIDE) ZONE: MOST DANGEROUS because: students board and exit from this side; children may move forward or backward along the bus side before crossing; may run between buses; the right-side mirrors have viewing limitations especially for young, short students close to the bus; the right-rear corner is especially blind; REAR ZONE: Extends approximately 150-200 feet behind the bus (the following distance of approaching vehicles at speed); students who walk behind the bus enter the path of traffic; drivers in following vehicles cannot see students emerging from behind the stopped bus. STATISTICS: Most school bus pedestrian fatalities occur within 20 feet of the bus and most on the right side — confirming the right side as the highest-risk zone.