Most drivers are ok right? After all, most of us cyclists are drivers too! But too-close passing seems to be endemic in urban commuting. For many it seems to be ignorance and lack of consideration. But there are a few out there who are just downright malicious. Like the ones who squeeze past you 30 yards before a red stop light, then dive to the pavement to block you passing on the inside. So you cruise past on the outside and up to the Advanced Stop Line. It then takes them three sets of lights to catch up, whereupon they attempt the whole pathetic manoeuvre all over again. As with all bullying it's essential to stand your ground. It's intimidating, but rarely results in an actual collision. So get used to it, and fight back. You have far more manoeuverability, and a much greater sense of the roadspace than they do. Use that knowledge to your advantage. I find a quick wobble towards them as they pass really puts the wind up them. You are not responsible for the fragile egos of boy racers offended by your better progression on a bike. You are responsible for your own safety and dignity. A bike is a better vehicle in congested traffic. Just go out and demonstrate that principle.