Words4EV.speak 1.0 (en)

Rolling is a broad band noise of rather low frequency with a preferred frequency band depending on the road surface, mainly low for a rough road surface, high for a wet road or equilibrate between low and high for a smooth road. It is broad band but less directive than "Load" and "Ventilation". Good rolling possesses a low level, is steady, gliding and is recalls a treadmill. It is unsteady when fluctuations or emergences such as "hooting" occurs, if it is too low and erratic it gets closer to "drumming". Rolling is a natural noise inherent to the vehicle, informing the driver about vehicle speed. The vehicle speed as well as the vehicle type mainly affect level. This noise is due to the tire/road contact, exciting among others things the wheel rim mode and panels.