Straight tracks lock

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That illustrates it perfectly. The monuments follow the road. In your example, where the land is hilly, the route must follow the terrain and so straight lines will not be apparent. Elsewhere, straight routes can be seen for very many miles. Textbook version is that Roman surveyors were the only people capable of surveying straight lines over long distances and did so through virgin forest and featureles moors. Yet I can show straight tracks in eastern England that have long barrows, henges, round barrows and hillforts alongside. All were in place and served by the trackways long before the Romans took them over. Now, of course, we have done the same and turned them into stagecoach routes and then A class trunk roads.

PeterH, I dont know why, but, all the straight lines that I detect are a series of nine parallel lines, aprox 200 feet apart at their max.
They then repeat at aprox another 400 feet , again as nine lines 200 feet apart, add infernitum.
Therefore if you came upon an obsticle, however wide or high, you can veer off at an angle, follow the same compass direction, then veer back and pick up the origonal track, look at the fosse way.
Also, when I walk my dogs , and have my rods with me.
If I take a bearingof say 90 degrees, I can look along my rods, see a feature many miles away and head for it, if I have to wander around because of hedges etc, no problem, because I know the feature I am heading for, when I arrive at or close to this feature, again if I take a bearing of the same 90 degrees, I will see another feature and head for that.
If I have to veer off say six bands of nine lines, then I know that if I veer back across six bands of nine lines, I will be back on my origonal line, to an inch.
I realise that ancient men would not have had a compass, I doubt if they would have needed one though, they would have been great trackers, just as people in the rain forests are even today.
Kevin