Looks like the A2 heading towards the M25, London-bound.
It's obviously a busy bit of road virtually 24 hours a day, and to be honest, it doesn't look particularly busy at the time the film is shot. It's all flowing well.
The rider's problem is that he doesn't seem to have any plan in mind... he's wandering around in the lane, following a truck far too close where he can't see anything, and when he does change lanes it's a vague drifting - it takes him around 10 seconds to do his first lane change.
Then he sits behind the truck, misses a huge open space to move to the right again (before the bike goes past), then sits almost on the line and waits for a bunch of cars that are all too close together, then moves out again - at which point the Merc nearly takes his front wheel off.
I think the Merc has come from the lane on the left behind him. There's a black car joins the main carriageway @20s having pulled onto the dual carriageway at the previous junction, which the rider moves out for and then gets stuck behind the truck.
The Merc waits for the bike to pass, accelerates across the back of the bike whilst he's pratting about behind the truck, and into the lane to the right of the truck and bike, so that the rider finally gets round to passing the truck, he pulls out directly in front of the car which is headed for the same gap - hence the aggressive swerve round the bike.
The chances are that the rider has got so focussed on looking for a gap to pull out into (you can see that from the way he's sitting behind the truck) he's not actually looked to see where the cars around him are, and where they are going.
If that's the right answer, less like Murder by GKxx xxx and more like attempted suicide.
It's a classic illustration of why getting too close to the vehicle you're trying to overtake is a mistake (and it doesn't matter whether it's on a dual as in this case or a single carriageway). If you are that close behind, you can only accelerate AFTER you've changed position.
It's far better to hang back, then use the space in front of you to accelerate before you move out. Hanging back means you also have the freedom to watch the mirrors (BOTH mirrors) without worrying about running into the back of the vehicle ahead.
On a dual carriageway, that means you can match speed with the adjacent lane so that it's far easier to merge into a gap.
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"Force has no place where there is need of skill" Herodotus 450BC :burnout:
