Horse wrote:TripleS wrote:Initially I was surprised by Mark's comment, but on further consideration I agree the limit point is less readily identified at a crest, compared with a bend. It's not as precise.
What can it be other than the furthest bit of tarmac visible?
Use anything else as guidance, for sure, but the absolute VP is created by the point where road and sky (or other background) meet.
I know it is, but (for the moment) I still think there is something in what Mark says.
In the case of a bend, the limit point is typically where a more or less horizontal line (the road edge) meets a more or less vertical line represented by some sort of solid obstacle to further vision along the road. That seems to me a fairly clearly identifiable point, and the distance to it can therefore be judged fairly accurately.
When we are approaching a summit I think it is less easy to accurately judge the distance to the last bit of road surface you can see, especially if the summit is actually a large radius curve as opposed to a sharp hump.
That's maybe not the best way of explaining it, but I know what I mean.
Best wishes all,
Dave.