Plot timeline and other stuff.

I’ve written parts of this story here and there in sections and chapters, and now I’m trying to join those parts up and properly work out how they might fit together in actuality, or what else might happen so that they make sense together and, the hardest part (I find), why they happen at all.
But it looks like I’ve just about figured out the main timeline (or the two main characters’ parallel timelines) for my second book that I’ve been writing (on and off) for the past year or so. So there’s nice.
Spoilers? I mean I don’t think this counts as spoilers. But if you can figure out my scrawls and you care in any way - spoilers. But it’s unlikely they’ll make much sense to anyone.
I’ve also just about figured out the opening, I think…
It opens.
How far back should we go? To the origin of the Universe? It hangs there, pregnant with Future. Is that too far back? It might not even be far enough. We could go back to any point in time, really. Perhaps to the time a train went into a mountain but failed to come out the other side? It’s all related, after all. The interconnected web of history is sturdy and reliable as far as a story is concerned. No. We’ll go back to the car.
It was night. A car was making its way along a road. It was steady in its progress. Taking the road’s curves calmly and with assurance. Maintaining a steady speed as it rounded a particularly blind corner.
It made its way safely out of the corner and onto a straighter part of the road. Near enough immediately after that the front of the car pounded into a man’s knee caps, followed closely by his thighs, his abdomen, his thorax and his skull, before causing him to tumble into a heap of unfortunate death.
If he had had time to react to the situation, the man would have been extremely frustrated by the fact that he hadn’t seen such an obvious certainty coming.