The purpose of presented analysis is to examine the possibility of improving vehicle performances by exploiting automatic devices fitted to a vehicle. The paper presents the results of investigations of vehicle dynamics, which is equipped with an antilocking braking device (ABS) and traction control one (TCS). A four-wheel non-linear model of a car is applied. The algorithms of control of ABS as well as TCS are proposed. Their technical realisation is done by means of fuzzy logic method. The paper outlines the process used to create fuzzy sets and the rules that define the fuzzy controllers. The obtained results of the simulation presents the effectivness of ABS and TCS in different road situations.