Distance vs curvature
When looking at this picture, the road comes to an end and any vehicle disappears with it. The sides of the road narrow almost, but not quite, to a point. The landscape, from our elevated eye sight, appears to rise up and meet the sky, (horizon line) but it is not. If a plane was flying over head it would appear to be coming down to the horizon line, but it is not. We assume the ground, in places we can see it, is level. We have to believe one of two possibilities about what occurs at the limit of our own horizon line.
We are told that the curve of the earth begins and the disappearance of the car is partly due to the curvature of the earth. The other possibility is that the car has not gone over a curved earth but is only beyond our ability to see more than two to three miles. I would suppose that if a pair of binoculars brought the car and more of the road into view we would conclude that there was no curvature but only distance.
--Dave
View attachment 25207