desireearmfeldtRiding my bicycle from Harvard to Davis at rush hour, I observed the following:
1) While I was stopped at a red light, three separate cyclists passed me from behind, in order to run the light. While this is both illegal and foolish, at least they had decent visibility and could presumably see (as I could) that there were not actually cars about to squish them flat.
2) I then passed a cyclist wearing earbuds but no helmet (on Mass Ave at rush hour).
3) Coming out of Porter, I nearly ran into a car pulling some sort of U-turn shennanigans because the visibility was poor and I couldn't see the car until I was almost on top of it. I stopped to wait for the car to finish its shennanigans. I heard two cyclists approaching to pass me from behind, simultaneously, one from either side. Since I was pretty sure they couldn't see the car, I put out a hand to gesture Stop. The left-hand cyclist stopped; the right-hand cyclist kept going. No actual collision, but I bet both he and the driver were pretty surprised.
4) Heading into Davis, I saw a pedestrian enter a crosswalk and stopped for him. The cyclist behind me kept going, nearly ran him over, and pulled up short at the last minute.
5) We then both tried to pass a van that was stopped at an intersection where it should have had the right of way, only to discover that in fact it was stopped to allow pedestrians to cross in a crosswalk (in this case, against the lights, right after the right-arrow turn onto College Ave) -- again, there was pulling up short but no actual squishing of pedestrians. (Minus points to me for disobeying my own rules.)
There are two morals to this story:
1) The rules of the road are there to let everyone have their turn to go without smacking into each other. Ignore them, not only at your own peril, but that of everyone around you. This goes for cars, bikes, and pedestrians too -- if you cross against the lights at College ave, you're impeding the flow of traffic from the right-arrow, and you're risking a driver/cyclist not seeing you in time to stop.
2) If someone has stopped in front of you (either your vehicle type or a different one), they have most likely stopped for a good reason. Possibly to avoid running into something that you cannot yet see because you are behind them. It is not a good idea to pass someone who has stopped for a reason, because you are likely to run into the thing they have stopped to avoid running into.
(Also, though not a moral of this story, I can't help but mention another fellow-cyclist peeve of mine: if I'm stopped at a red light, and you come up behind me to stop at the light too, you should fall into line behind me, rather than jumping the queue. This is understood for cars, mostly because it's usually not possible to do otherwise. Why do cyclists not consider it impolite to queue-jump? It seems quite rude to me.)