Of course we do. The roads are deliberately constructed with a camber - a convex curvature in the tar-mac maintaining height at the road centre.
Science part over.
In Istanbul, the roads are nice and flat.
Of course they are.
During the rainy season large puddles form across the roads. Steeper local streets turn in to white water rapids, stairways into cascading waterfalls, and main junctions become urban, traffic-heavy lakes.
Most of the time this is simply a nuisance. If you've chosen the wrong pair of shoes you might find yourself sitting in soggy socks for a large part of the day.
For these guys working outside of our office one morning, it's a genuine hassle.
They were trying to do repair work on subterranean telephone systems and, to avoid working under a soaking wet waterfall from another nasty road-lake, they collected mud from nearby plant pots and constructed a miniature, inverted dam around their man-hole, keeping the potentially dangerous water at bay.
Of course they did.