How do curbs protect Roadways?

Curbs are designed to channel water along the sides of the road and eventually to a storm drain or a 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 like a creek, river, or maybe even a field where they are less likely to do any damages to the roadways. Without this simple invention, water would drain along the sides of the road by a ditch and eventually to a culvert. If the volume is great enough and strong enough, it can start to washout around the openings of culverts, and even worse, undermine the roads that you might drive on