Alright, normally, when I come up to a stop sign (when I want to go straight), I stop. I then look both ways and when I'm satisfied the road is clear, I will go. This has pretty much never failed me, except for one night last December.
I was going straight and came upon a stop sign, whereupon I stopped. I looked both ways, the same as ever. Satisfied the road was clear, I pulled forward, but then I noticed this car coming from my right and I crashed into it! Sadly, I was at fault, though I took my usual precautions. In the month following, I noticed other times, where even though I looked both ways, I seemed to miss cars that were in the field I scanned, that were between the most extreme points my eyes saw. However, after that, I stopped having that problem.
During that period where I had that problem, I was on Zyprexa. It seems that when I went off Zyprexa, the problem stopped.