Deceleration: 8 m/s² · 72-passenger bus (aisle ≈ 8.2 m) · Child unrestrained, standing in aisle
Impact speed is the child's velocity relative to the dashboard at the moment of contact. When the bus stops before the child reaches the dashboard, the child hits a stationary surface at the bus's original speed — which is why all positions beyond ~3 m show the same impact speed at low bus speeds. White lines mark severity zone boundaries. Dashed line marks the back of the bus aisle. Injury thresholds from published biomechanical literature for child occupants.