Driving north from central Georgia, one quickly runs into the southern end of the Appalachian Mountains, and while they lack the altitude of the Rockies, they can present many a challenge to a driver, from heavy rains and fog in summer to ice and snow in winter. These roads can be risky even in dry conditions, but when the weather turns dangerous roads can become deadly. In Virginia last weekend, a torrential rainstorm caused a 41-vehicle crash that shut down a section of Interstate 81 for hours and sent 10 people to the hospital, including two who need to be airlifted from the scene. The heavy rain combined with the sun coming out at one point, caused visibility to drop to less than 20 feet, according to one witness. Police attributed the car accidents to the rain and driving too fast for the conditions. These mass pile-ups can lead to horrific consequences,…