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4/11/78 AC 150/5300-48 CHG 2 CHAPTER 8. TAXIWAYS, TURNAROUNDS, AND HOLDING APRONS 34. GENERAL. Taxiways are constructed primarily to facilitate airplane movements to and from the runway. From a use standpoint, taxiways can be classified into one of three groups: parallel, exit, and hangar and apron access. 35. PARALLEL TAXIWAYS. During the initial runway development, considera- tion should be given to including a parallel or partial parallel * taxiway. When the construction of a full parallel taxiway is not practicable, consideration should be given to constructing a partial parallel taxiway. The construction of a parallel or partial parallel taxiway will significantly improve the airport's safety and efficiency. 36. EXIT TAXIWAYS. a. For a runway with a parallel taxiway, generally three exit t»x;ways will be sufficient, i.e., the two end exits and one approximately at the center of the runway. If a parallel taxiway or partial parallel taxiway is not needed, then one exit taxiway leading directly from the runway to the parking apron may be adequate. b. Figure 8-1 shows the recommended fillet radii for taxiway -runway intersections. A special study was made of the fillets needed for the exit taxiways at the ends of the runway. While it might appear that increasing a fillet radius would allow more rapid operations to and from the runway, the normal ground operating speeds of utility airplanes are such that the overall effect on airport capacity is negligible. c. As traffic increases, particularly at the General Utility airport, the number and location of the exit taxiways will significantly affect the airport capacity. Accordingly, the prime considerations for constructing an additional exit taxiway should be safety of operations and the degree of increase in airport capacity. 37. HANGAR AND APRON ACCESSTAXIWAYS. The most common use of an access taxiway is to provide access to the T-hangar area. Generally, a 20-foot-wide taxiway will serve this function. Figure 10-2 shows the clearances recommended between hangars. Taxiways providing access to tiedown areas, separate from the parking apron, may also be constructed at the 20-foot width. Chap 8 Par 34 Page 39