If we only consider that the people in village A are closest to highway AB, as long as we draw a vertical line from village A to highway AB and intersect with highway AB at point C, then point C is the closest point from village A to highway AB, but it is far from village B. On the contrary, draw a vertical line from village B to highway AB and intersect with highway AB at point D, then point D is the closest point from village B to highway AB. But at this time, it is far from point d of AB road in village a. Because this topic requires us to take the construction site on highway AB, we can consider that people from villages A and B will not go the wrong way to this station (that is, the sum of distances is the shortest). According to our experience, it is the shortest to walk a straight line between the two places, so as long as there is a straight line between Village A and Village B, the intersection of this straight line and AB Highway is P, which is the requested bus stop (Figure 2). Connect village a and village b with a straight line. Because village A and village B are on both sides of the highway, this connecting line must intersect with highway AB. Let this intersection point be p, then establishing a bus stop at point P will make the sum of the travel distances from village A and village B to the bus stop shortest.