Whatever the drag force of a crosswind might be, there is one thing for certain. Winds coming from the direction of the road shoulder are not nearly the issue that we have with winds coming from the direction of the opposite lane. On a cross country motorcycle trip, many years ago, I happened to ride through Oklahoma when I had a very strong crosswind from the opposite lane. That of course tilts the bike toward traffic. I slowed down a bit and once in a while a truck would pass me. It was very hard not to get killed. So great caution under those conditions!