"Paint what excites you!", is probable one of the best advice I got in art school. If the subject doesn't excite you, just forget it, it'll be a struggle from the beginning to the end, so you might as well spend your time on something else.
There is something about roads, traffic jams and the view from above that excites me. I like trying to see the beauty in these often ugly man made sculptures we usually don't consider anything that pleases the eye.