Where am I going?

This morning, as I was driving in the company car (mine is still being fixed, or so the mechanic lies to me) down a local road I noticed something interesting. According to the route marker, I was heading North, but the big, red ball we all agreed to call the Sun was shining in my face. This would mean that I was actually heading East. How could the roadbuilders get so confused? I am sure that the roadbuilders in ancient Rome knew East from North and West from South. But it seems this knowledge did not survive the Dark Ages. And so I find myself in this age of GPS satellites and turn by turn navigation heading in the wrong direction.