Ditto Velo_nut! It was chilly when I started out but it was clear and beautiful! No traffic issues for me either. 30 minutes in. I even beat the ferry which was excellent. Downtown was fairly quiet this morning.
I left by 5:30 am and there was no traffic at that hour :) I agree, I bet it was the sun. All cars come with handy sun visors, people should really use them some time.