^ probably just people that aren't used to seeing a bicyclist on the road. If you left at 5:10 every day, the buzzes would stop after a few days.
The weather continues to be gorgeous here in southern PA. Low 50s in the morning, upper 60s in the afternoon.
Dram - if you like blue herons, come farther south. They're such a regular sight around here that most people don't even watch them.