What's the vector Victor?

I suck, i went for a cruise for an hour with my D40 and a tripod, and still managed to mess up a large portion of the images i took.

I managed to get a couple of REALLY slow shutter shots of some water with a road behind, but not enough cars went by to get the lines i wanted.

So i hit up the little airport in Pontoise, and lo-and-behold, i managed to get a decent one...execpt for the marks on the lense, but hey...nobody is perfect right?!