7. Do not overshoot final or continue on a track which will penetrate the final approach of the parallel runway. 8. Do not continue on a track which will penetrate the departure path of the parallel runway. FIG 4-3-4 Headwind/Tailwind/Crosswind Component Calculator 4-3-4. Visual Indicators at Airports Without an Operating Control Tower a. At those airports without an operating control tower, a segmented circle visual indicator system, if installed, is designed to provide traffic pattern information. REFERENCE- AIM, Para 4-1-9, Traffic Advisory Practices at Airports Without Operating Control Towers. b. The segmented circle system consists of the following components: 4-3-6 Airport Operations