As far as I recall, I did not see them when I took the photo. On the roads in Iceland my traveler's eye became relatively uninterested in the presence of persons, attracted instead by the wide expanses of blue and white, and green.
I suppose it is the opposite for the residents.
When I got home, I wondered who they were and what they were doing: perhaps a mother telling her son to be careful, to be home before dark?
What could this mean in Iceland in the summer?
