Warning Signs If when driving at highway speeds you hear a muffled thumping noise from your tires, you may have tread separation that requires immediate attention-or even a flat.

警示信号在高速行驶时，如果你听到汽车轮胎发出低沉的撞击声，汽车轮胎面有可能脱落，必须马上重视起来——或者甚至是轮胎漏气。