I saw only a one cyclist in the mountains yesterday, in 60 miles, to whom I gladly waved, or rather yelled something to, since I was descending behind a line of cars riding the brakes pretty hard.
What annoyed me slightly was that almost ever single person in a car who had their window down waved, and that got kinda old after a while. So I just stared at the road in front of me, and probably rubbed a few motorists the wrong way, but so be it. Only saw maybe 100-150 cars the entire day, so NBD.