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I think most measurers would draw the finish line perpendicular to the SPR. But your average Joe could draw it in just about any direction, parallel to the road is just as likely as perpendicular to the SPR. In this case I think you have to give more description of the finish than just a single point.
For the case where the finish is on a road, your average measurer and your average Joe would both draw the finish line across the road, perpendicular to the direction of the road.
Easiest thing is to specify at least one line of sight that the "spot" finish will be placed. For example the extended north face of that building. Then the 22 m from the building becomes more precise. Better yet would be distance from the road, either along the SPR or a perpendicular distance. The angle of the finish line is not a big issue and as Mark says, not hard for average RD to figure out.
You definitely need measurements from two landmarks. With two measurements, you limit the number of points that meet your description to two, and by adding compass directions (or, as Bob suggests, the line of sight), a reasonably competent person can easily eliminate one of them.

A stipulation that the finish line should be set perpendicular to the race route on the last stretch wouldn't hurt, either- although as mentioned in the other thread, we simply make that assumption when a finish line is on a surface with defined sides, and it is far from a stretch to make that assumption here.

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