When is to much soundproofing not a good thing? When a driver hits a cyclist and continues driving 2km with the bike stuck under her car claiming that the soundproofing of her Lexus is so good that she didn’t hear enough to alert her that something was amiss. Do you believe her? The court seems to have let her off pretty easily our guess is the that the biker was not hurt to badly. Read the car soundproofing incident .