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48 Air Regulations, 1938
according to the rules contained in paragraphs 25 to 29 hereafter, as soon as it is apparent that, if it pursued its course, it would not pass clear of another aircraft.
25. When two mechanically driven aircraft are meeting end on or nearly end on, each shall, without prejudice to the application of the provisions of paragraph 20 of the present Part, alter its course to the right.
26. Subject to the application of the provisions of paragraphs 20 and 33 (c) of this Part, when two mechanically driven aircraft on courses which cross, the aircraft which has the other on its own right side shall keep out of the way of the other.
27. An  aircraft overtaking any other shall keep out of the way of the overtaken aircraft by altering its own course to the right, and must not pass by diving.
Every aircraft coming up with another aircraft from any direction more than 110[[?]] from ahead of the latter, i.e., in such a position with reference to the aircraft which it is overtaking that at night it would be unable to see either of that aircraft's side lights, shall be deemed to be an overtaking aircraft, and no subsequent altercation of the bearing between the two aircrafts shall make the overtaking aircraft a crossing aircraft within the meaning of these rules, or relieve it of the duty of keeping clear of the overtaken aircraft until it is finally past and clear.
As by day the overtaking aircraft cannot always know with certainly whether it is forward or abaft the direction mentioned above from the other aircraft, it should, if in doubt, assume that it is an overtaking aircraft and keep out of the way.
28. Every aircraft which is obliged by the rules of this Part to keep out of the way of another aircraft shall, if the circumstances of the case admit, avoid passing over of under the other, or crossing ahead of it. 
29. Where, by any of the rules of this Part, one of two aircraft is to keep out of the way, the other shall keep its course and speed. When, however, in consequence of thick weather or any other cause, the aircraft having the right of way finds itself so close that collisison cannot be avoided by action of giving-way aircraft alone, it shall take such action as will best aid to avert collision.
30. Every aircraft in a cloud, fog, mist or other conditions of bad visibility, shall proceed with due care, regard being had to the existing circumstances.