+1 on the programmed response...but it's quite possible that she didn't see you because some people just don't look very carefully - just a quick glance, and if they don't see something the size of a Mac truck, it must be clear.

I've felt like the invisible man this year, especially in the last several weeks. I've had at least six close calls with drivers turning into a collision course with me, only to notice me at the last second and jam on their brakes. They either didn't see me because they didn't look carefully enough, or they didn't realize a cyclist could move that quickly.