Person sitting behind the steering wheel* of an Addison Lee people carrier last night.
You cannot respond to people hailing you from the curbside. Ergo, you knew for a little distance at least where you were going to pick up your passenger from, which means you didn't need to pull that manouvre. Frankly, even the most avaricious black cab driver wouldn't have done it.
In this country by convention and law people drive, cycle, ride horses, drive their ponygirl etc. on the left hand side of the road. so, I and the other road users are following that convention. Being on a bicycle in free moving traffic, I'm riding over to the left closest to the curb. To my right a series of cars are overtaking me and they're a little close because there's a traffic island just ahead, but they're not too close and everything is all happy.
Until you come along, you great pile of knob cheese. You're travelling in the opposite direction to me (and the cars overtaking me), but the person you are picking up is on my left. So, what action do you take? Do you indicate right, come to a standstill and wait for a gap in the traffic before pulling into the driveway that will be on my left in a moment?
No, you don't. Because that would be the act of a rational person who gave a fuck about the rest of the human race.
No indeed, what you do is without warning or signalling dive off to your right and then drive along the wrong side of the road in the gutter. Now I've got traffic overtaking me on my right, getting close because of the traffic island, and you, you dribble from the chancre on my cock, you driving straight at me.
If I ever meet you again, I promise you that for the rest of your life you'll never suffer from constipation.
* I think driver would be stretching it a bit too far.