All forward facing wing edges including wings, end plates, Gurney flaps, wicker bills and undertrays that could contact a pedestrian must have a minimum radius of 5 mm (0.2 inches) for all horizontal edges and 3mm (0.12 inches) for vertical edges (end plates). These radius requirements must be achieved with permanently affixed components and with specific design intent to meet this radius requirement.
For example, pushed on pieces of split tube relying on friction for retention are not a satisfactory engineering method of achieving the radii.