inreb,

Yes, as vehicles move, the blind spot changes. Specifically, car B (ahead of you going your way) hides you from car A (coming at you and maybe planning to turn left) at different times, depending on where you are with respect to car B.

If you are riding bike 1, following car B in the same lane, leave enough room so the driver of car A can see you early. It helps to wiggle your headlight across car A, but conditions may make that a poor idea. Either the driver of car A will see you and not turn, or there will be time for you to avoid car A or at least brake a lot before hitting it (yes, I have done both). When car C changes lanes and gets between you and car B, then it is your new car B; mutter curses if you like, but fall back and leave room. If you do, you may be delayed; if you don't you may be injured or worse.

If you are riding bike 2, following car B in a lane to the right of car B, then you will enter and leave the blind spots of oncoming drivers (car A and then the next car A, etc.) as vehicles move. The vital thing is to stay reasonably close to car B (but still in a lane to its right) so that car A doesn't have time to hit you, even if the driver never sees you. Indeed, even if the driver of car A hurries the turn, when car A misses car B, it must go behind you ... if you have timed things right.

And there is a hazard associated with this safety manoeuvre. You are probably in the blind spot of the driver of car B! As soon as you have positioned yourself so that car A cannot hit you, put some more attention into watching the posture of the driver of car B. Maybe ooze forward until you are even, and look at the driver and try to judge if you have been seen; if not, please select another car B. There will be one along any minute now, especially in GTA!

But do not concentrate hard on any particular vehicle, because more of them are presenting hazards from all directions. You have to keep your eyes moving. My signature is never more relevant than it is now: