You may be able to adequately mark critical points by an alternative
means.
Do you have the ability to mark fixed points just off the pavement? If
so,
you could either knock some rods or pipe in the ground and use distances
(measured with a string?) to define some intersecting LOPs. Of if
distances
are too far for a tape or string, maybe you could set up some visual
ranges
to mark the positions...
Matt
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