He publish flight safety advice to pilots explaining:
• How features such as valleys, VFR lanes or edges of controlled airspace constrain aircraft onto similar courses and concentrate traffic density;
• How similar performance aircraft may converge laterally or vertically where lookout is most difficult;
• What steps to take to compensate for this difficulty;
• That an essential part of visual collision avoidance is a low traffic density. Good airmanship includes consideration of when and where to fly, with this in mind.
