In the field of social thinking the question of norms give rise to several publications. Moreover there exists no study in this theoretical framework concerning Cameroon drivers’ relationship with the rule. In order to understand this, a group of 50 motorists filled out a characterization questionnaire on driving, purposely oriented to the use of the mobile. The instructions to the drivers were to fill it out for themselves (standard condition) and for other drivers (substitution condition). The results confirm the role of the substitution instructions in bringing to light inadmissible offences with standard instructions. It can be concluded that the Cameroon drivers are well aware of the rule and that they tend to attribute the greatest transgressions to other drivers.