Maybe that's a Washington thing, then. In the Portland area it's nearly all asphalt, or asphalt-over-concrete. Concrete is terrible in places where it rains a lot, which is one reason I'm surprised you'd find so much of it in Seattle. We have porous asphalt that never has any standing water even in a downpour. At least when it's maintained, which isn't always a guarantee on some lesser used roads.