Drivers get really PO'd when they are stuck in traffic & you're riding right past them in the bike lane, especially when you pass them 3 or 4 times and they are stuck, then when they finally get moving they have to rev their engine as they pass you. You can usually tell by looking at the driver that they've never ridden on a bike (or get any other form of exercise). What we're dealing with is just plain ignorance. Some will actually look you right in the face & then cut in front of you anyways. You know they saw you, but they don't care, they are going to go anyways. Then they are mad when you yell at them!