Fillets
Chicago O'Hare Aerial view
Fillets between taxiways and a runway
Fillets near a runway at Reagan National
Intersections between runways and taxiways use fillets to provide a smooth curved pavement edge (see Image).
Fillets present a special paving challenge because airfield pavements are normally paved in long straight pulls. In most instances, fillets can be paved by gradually extending the screed on the fillet side while paving in a straight line; often called “winging out”.
Fillet edges constructed in this manner are likely to be less than perfect, however handwork on the edge and final grading near the edge can usually make them quite presentable. If necessary, edges can also be sawcut.