I agree with you, Oak. Drivers who randomly stop because they think they are being nice in these types of situations are a menace. Massachusetts is famous for them. I see it at the 4 way stop by my house, all of the time. Instead of orderly following the rules, people come to the stop sign, stop, and wait to go until another car is stopped. Then, they both sit there and wave each other on, like "You go, no you go!" Add a bike into this mix (which happens very, very frequently), and it's a comedy, except it's dangerous. People around here hallucinate stop signs on a regular basis. I feel the same way about cars who go over the yellow line, on the opposite side of the road, to pass me on my bike, when there is plenty of room to do it safely. There's going to be a head on collision one day.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
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2017 Specialized Ariel Sport