It is well documented that active suspension systems offer substantial benefits in ride comfort, handling, and attitude control over traditional passive systems. However, restrictive features such as the power required and costs make an active system impractical. To solve the problem of the power required, a semi active suspension system has been developed. The present paper aims at providing a review of the present state of the art in the semi-active suspension control field in terms of vehicle ride comfort and road-holding performance evaluation.