All measures to improve the active safety of the car are closely related to the S — K — D system. The content of the basic function of active car safety is to prevent sudden failures of the car's structural units, especially these, which affect maneuverability, car, and ensuring that the driver can drive the car confidently and comfortably, affected by the road.

Another important function of active safety is the adaptation of the dynamics of the driveline and braking characteristics to road conditions and transport situations as well as to the psychophysiological properties of the driver..

The ability to perform a maneuver while driving essentially depends on the dynamics of the drive and braking systems; the effectiveness of the braking system affects the braking distance, which should be as short as possible, in addition, the braking system should allow the driver a very flexible choice of braking intensity.

The dynamics of the driveline significantly affects the well-being of the driver in such driving situations, how: overtaking, passing, drive through intersections and across roads, that is, when performing horizontal maneuvers. In these cases, however, when the maneuver in the spirit level is impossible due to the thickening of obstacles, and it is too late to brake, then the dynamics of the driveline is essential, allowing you to get out of an emergency by means of pre-empting events.

The structural diagram of the active safety function of the car is shown in the figure.

Among them, there are two basic functions: emergency safety, certainty of the actions of the car's assemblies in the event of unexpected breakdowns, and operational safety, determined by the reliability of the operation of the car and driver units, that is, the S — K system.

The implementation of the active safety function depends on the design characteristics of the car. The basic specificities of a car influencing its active safety are:

- design solution of the system;

- stability, that is, the car's ability to counteract it from being thrown or rolled over in a variety of driving situations, at high driving speeds;

- controllability, that is, the set of these properties of the car, which make it possible to steer it with the lowest consumption of physical and mechanical energy when performing horizontal maneuvers, necessary to maintain or change the direction of traffic;

- maneuverability, that is, this property of the car, which is expressed in the smallest turning radius and dimensions of the vehicle;

- stability, defined either as the ability of the S-K-D system components to counteract the transient motion of the car, or as the ability of the S — K — D system to self-actuate (or with the assistance of the driver) maintaining the optimal direction of the main axes of the car while moving,

- braking system, to ensure the reliability of work which is used: independent circumferences of the front and rear wheels, automatic adjustment of play, allowing the same response time, and anti-skid devices when braking;

- steering system, whose task is to ensure constant coupling between the steering wheel and the contact zone of the tire with the road surface with the least possible effort of the driver's muscles, and which should function reliably in the event of an unexpected failure and have a considerable margin of ability to get the job done due to abrasion (wear) core teams;

- correct alignment of the steered wheels of the car, which ensures that the assumed driving direction is maintained in the event of an unexpected critical situation (failure), often complicating steering;

- reliable tires, which significantly affect the car's driving safety and allow traffic with an appropriate distribution of forces in the zone of contact with the road;

- signaling and lighting.