Interesting that despite the sun being "in the driver's eyes" and the fact that their visors weren't down, they were not only able to see the cyclists, but they were able to see them in time to prepare for and execute their assault.
It must have been both frustrating and difficult with all the vehicular traffic for the driver to move into the left lane to pass.
Oddly, sadly and ironically, it is likely that the drivers would not likely have been charged with anything at all had they simply run the cyclists over and said "I didn't see them." Even on these advocacy pages we are quick to excuse sun angles as a reason for making cyclists "hard to see."