Civil Engineering PE

Answer: D - “Superelevation” is not a type of horizontal roadway curve. Superelevation is described as banking of a roadway curve to counterbalance the centrifugal force of a vehicle moving through the horizontal curve. Because of the additional side friction that is developed between a vehicle’s tires and the road surface, superelevation allows a vehicle to negotiate curves more safely at higher speeds than if the roadway was flat.