How do curbs protect Roadways?

Curbs are designed to channel water along the sides of the road and eventually to a storm drain or storm water runoff. By channeling these thousands of gallons, this simple concept allows water to pass through pipes or along a channel to a safe place of deposit like a creek, river, or maybe even field, where they are much less likely to do any damage to the roadways. Without this simple invention, water would drain along the sides of the road by a ditch and eventually into a culvert. If the volume is great and strong enough, it could start to washout around the openings of culverts, or even worse, undermine the roads that you might drive on.