  Drivers are agents, they are members of the group of drivers. Human groupings
have hierarchical structure. The civilization consists of societies, societies
consist of groups, and groups consist of individuals. We will consider the
group of drivers. Every social group has power to organize individuals and use
them for its own purposes. This is true also for the group of drivers. An
agent, a driver, we call a member of a social group of drivers, we assume that
his-her special properties are defined: they are agents driving a car. A
driver-s behavior is influenced to some degree by the need to associate with
other drivers and to obtain the approval of other drivers in the group, this is
a general property of agents in a group. A driver equates his-her needs with
those of the other drivers from the group. From this we explain how three
empirically observed dependencies of personal driver radius dependence on some
factors enabled us to identify quantity which characterizes verification of
information by a driver. The smaller personal radius the larger process of
verification of verbal and non-verbal information about the other person in
other to accept the risk that this person will be closer to us as a person
(driver). We expect that this conclusion is a general conclusion.
