| Here in the UK, where we drive on the left and overtaking is only allowed to the right of slower vehicles under normal conditions, there are some other variations: c- a vehicle in the lane to your left that you were going to overtake has itself caught up with a slower vehicle and wants to pull out to overtake it, moving into the gap in front of you d- a vehicle with an impatient driver is undertaking traffic (passing to the left of slower vehicles) and then moves into the gap in front of you. The first of these is a normal situation, but still results in a vehicle moving into the space in front of you, sometimes without accelerating up to your speed first. Fortunately, it's usually easy to anticipate this situation, and many drivers will helpfully drop back a little to allow more space for the other vehicle to move out. The second of these is a result of aggressive and probably illegal driving, and is more of a problem because the driver cutting in may well be going too fast, move out into a space that isn't really wide enough, and then brake suddenly. Still, in my experience these don't cause much delay if you're allowing a sensible gap in front. I find people who try to keep closer to the car in front to deter others from pulling into "their" space seem to get far more upset about these situations than I do. |