What is the purpose of "interception lines" in visual navigation?
The choice of the ground features is critical. Interception Line is a single and distinctive observed position line, which crosses the track and is ideal for timing or groundspeed check, (line features such as a river, railway, road, ridge or tree line).
But, if an interception line is reasonably close and runs roughly parallel to the direct track, then (airspace constraints permitting and not forgetting the right-hand rule) plan to keep it in sight, as easily recognizable guidance upon a possible loss of orientation. A modest increase in track distance is a small price to pay for being sure of your position.
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Austro Control