Hmm, i had this once. Oncoming car in narrow'ish two lane country road. Car coming from behind, we're all going to meet about the same point so i took what i thought was a good enough primary.
FARKIN ELL..../the b'stard squeezed though incredibly closely at speed, how in Gods name he never hit me or the oncoming car, i'll never know. Ironically, had i stayed in position, it would have been close, but nowhere near as bad.
Now of course, some will say you didnt assume primary correctly...yeah that's obviously true but there must have been millimetres between the car either side at maybe 50 mph, you just can't expect such fcukwittery sometimes. Worst incident in my entire cycling life.
I swear to god, if i'd have seen the guy later i'd have ripped his head off (figuratively speaking)