Yes, both routes are equal, just showing a other background aerial and map border Argentina. This is a important route for the people, who live along the river many villages towns. It must route over there, if router can not do it is not usable. Tagging a ford, there small fords and long fords, crossing the river or even ride in the river for several kilometer. Then you need to know, where the ford starts! (roadboak thinking ) Therefore i use the line to set the ford, very very, small ones, i use the node. But other do not think this way, they tag to easy way, one node is enough. On a line, they must cut the road and set tagging. To much work, . Water is drawn as a line (waterway=river) or as a polygone (natural=water water =river). The highway must be attached to the water, the line or polygon. Your example: ford=yes highway=primary surface=dirt primary, because The next most important roads in a country's system. (Often link larger towns.) There not much ways I was ticked on my fingers, that i have done to much track tagging to houses, this must be al least unclassified with surface. Reason, most routing program do not use track to route, you know that in Bolivia in rural we do not have low motorcar, we must route with high motorcar and truck. Highway tagging is tagging the importance of a road. All the othert tags, how it looks like, the usability, surface, smoothness. Same for a sportbike and a adventures bike. Although you can do a lot with a sportsbike around the world. Someone even set hazard=erosion on a way to mark points where erosion could effect the road. The node ford is not necessary, but it does not harm. Although one node is enough, not on all nodes of the ford line. You can filter this out, when a node is on a ford line do not show it. A ford line is more accurate. This example is what I ment with long ford to a village, a part (river) permanent flow (the cross), but the dry river to the village, key:intermittent (dashed line) is also riding in the river (ride through) and should be a ford with intermittent. The road is not always dry. Although on the sides but you see on the aerial how river flow marked the entire bank. The difference with intermittent and seasonal, seasonal is a certain period, the season, intermittent can happen all year long. Rainy season, use could be tricky. The road is not tagged as it should, what could happen on this road. Does it matter, one little point in a road can make a road impassable. In Bolivian on vacation in a area, you must think like a Bolivian.