Vantablack absorbs ultraviolet through far-infrared, so radar is probably not affected. Infrared laser speed measurement devices would have difficulty if aimed

Vantablack absorbs ultraviolet through far-infrared, so radar is probably not affected. Infrared laser speed measurement devices would have difficulty if aimed at the body of the car, which is why they often aim at license plates (which you may be stopped and ticketed for if you cover with an infrared-blocking plastic, as many do).