I've spent most of my life with cycling as my primary mode of transportation, living in Minneapolis, Santa Fe, London and SF/Oakland. I ride fast and generally try to go with the flow to avoid inconveniencing drivers while also being considerate to pedestrians. I think this traffic cone thing is pretty cool, but I have a larger observation to make:

Here's the thing about SF: everyone is way too fucking agro. Drivers freak out when they can't drive 50mph down a city street. The cyclists are banging u-locks on hoods because someone cut them off. Everyone is road raging like crazy.

I lived in London for 3 years, with all the narrow streets and everything overcrowded to the bursting point. Central London is 10x as crowded as SF in every way, and yet somehow the pedestrians, cyclists and drivers all manage to co-exist. It's not a panacea for sure, it obviously can't compare to Amsterdam, but the whole Keep Calm and Carry On mentality definitely applies to transportation. You know what happens? Buses pass other buses by going into the oncoming traffic lane and oncoming traffic moves over to accommodate them. Pedestrians spill into the streets sometimes, and cars don't kill them. Vans and lorries sometimes drive up onto the pavement (ie. sidewalk) in order to get around an obstruction. Pedestrians pull off to the side of the walk way if they need to pay attention to their phone. Everyone implicitly acknowledges: hey, it's crowded, we have to cooperate to get where we're going.

SF could use a lot more of that attitude. I thought the west coast was supposed to be chill.