At Highway Speed, the Tires Take Over
An electric motor can make a car feel remarkably quiet, but it does not make the road quiet. Once an EV is moving quickly, the sound of its tires meeting the pavement often becomes the most noticeable noise inside the cabin—along with rushing air around the body.
Each tire flexes as it rolls. Its tread blocks repeatedly press into and release from the road, while small pockets in the tread and road surface squeeze air in and out. Those vibrations travel through the tire, suspension, and body of the car, where the cabin can amplify some frequencies. Coarse pavement and certain tire designs make the effect more pronounced.
Why Speed Changes the Sound
At low speeds, an electric motor is usually quiet enough that tire noise may be modest, and some EVs add a low-speed alert sound to help pedestrians notice them. As speed rises, the tires encounter the pavement more often and airflow becomes louder. The motor is still operating, but its sound is less likely to dominate what occupants hear.
That is why an EV’s quietness depends partly on what it removes: without the familiar engine and exhaust sounds, noises that were always present can stand out. Automakers can reduce them with sound-absorbing materials, careful suspension design, and tires engineered to limit road noise—but the road surface remains part of the acoustic experience. A rough stretch of highway can make the tires seem louder than the car’s powertrain.
