Vehicles have different friction demands depending on the characteristics of the roadway. For example, a vehicle traversing a horizontal curve requires a greater level of friction than vehicles on a straight section. Common locations that require higher friction values are horizontal curves, steep grades, or intersection approaches. As a result of the increased friction demand, the roadway surface at these locations often becomes prematurely polished, reducing the pavement friction and contributing to higher crash rates. Excessive speeds or distracted driving can also contribute to the crash rates in areas where friction demand is high.