Those two threads are being in an unexpected place or being in a place much more quickly than the car driver expected you to be there. This is not the same as speeding. Drivers, in the main, have no perception of how quickly and nimbly a motorcycle can move. Your bike can move at a rate of acceleration a car driver simply cannot comprehend.
For example: you join the back of a queue of slow moving cars, with a Nissan Micra at the front driving at 25mph. You work your way to the front of the queue and tuck in ahead of the Micra. There is a car ahead of you, on the opposite side of the road waiting to turn right. As you pull away from the head of the queue the car crosses your path. You are there to be seen.
Nevertheless the driver turning right fails to note your presence. You have done nothing wrong. The car driver is wholly to blame as a matter of law, but how did this accident happen? It is because the car driver saw the queue of cars but failed to see your smaller and massively more quickly accelerating motorcycle. Legally the case is a slam dunk.
Another one of the classic collisions I have seen over my 25 years of lawyering is a straightforward win where a motorcycle goes for an overtake of two or more vehicles, and one of the drivers stacked up behind the slower moving vehicle goes for the same overtake, scooping up the lawfully overtaking motorcycle.
Again, this is an easy win in front of most Judges. The leading case on overtaking is Smith v Cribben, which says that a vehicle being overtaken owes a duty to maintain a safe and steady course. A driver moving to his tight and scooping up a motorcyclist who is already overtaking has breached this duty.
Bear in mind personal injury compensation is exactly that – it compensates you for your losses but is not a magic money tree. As somebody who makes his living providing compensation to injured motorcyclists I can tell you the crash is rarely worth the cash. So while the law in the Highway Code will not criticise you for using your acceleration and nimbleness it is wise to consider whether or not your being in a position in the road is unexpected, and if it is likely to be unexpected, be alert to the fact that other road users might do strange and dangerous things in front of you.
It is a matter of well-established science that the human reaction time to an anticipated hazard is three or four times quicker than that to an unanticipated hazard, so if you are going for a multiple overtake have it in mind that one of those cars might well bob out for the same overtake and cause an accident. And while, yes, you will win the case, motorcycle collisions are much better avoided than litigated.
Bike Magazine April 2019