What term is used for the additional pavement added to maintain the taxiway edge safety margin?

The term "fillets" refers specifically to the additional pavement that is added to maintain the taxiway edge safety margin. Fillets are designed to provide a smooth transition between the taxiway and the adjacent paved surfaces, ensuring that aircraft can maneuver safely without the risk of going off the pavement. This additional pavement helps to support the weight of the aircraft and improves safety by preventing edge erosion from water or other forces.

While "shoulders" typically refer to the area adjacent to the pavement that provides structural support and increases safety, they are not specifically for maintaining the taxiway edge safety margin in the same way that fillets are. "Buffer Zones" generally indicate areas maintained for safety, but they do not specify the added pavement aspect. "Extensions" relate to lengthening existing pavement surfaces but do not specifically address the safety margin aspect of taxiway edges. Thus, fillets are the precise term for the additional pavement employed in this context.