Abstract: The object of this research is the social relations established due to commission of administrative offences in the area of road traffic. The subject of this research is the federal legislation, departmental regulatory acts that establish competence of the internal affairs bodies in the process of substantiation of administrative traffic offences, as well as acts of interpretation of the Supreme Courts of the Russian Federation and the European Court of Human Rights. The main goal of this research consists in elaboration of the normative legal acts, law enforcement practice, and recommendations aimed at the improvement of substantiation in cases of administrative traffic offences. The article explores the problematic questions of law enforcement practice established due to substantiation in cases of administrative offences in the area of road traffic. Analysis of the current state of legislation of the Russian Federation that regulates such process in carried out. The scientific novelty of this work lies in revelation of problem points of acquisition, records and evaluation of evidence in cases of administrative traffic offences. The author determines the content of substantiation, its subject and limits in administrative procedures on road traffic offences. The essence of the principle of objective truth in case of administrative offence is revealed. Objective truth manifests as the purpose of substantiation. Claimant, a private party, is outlined as independent subject of substantiation, who reported on the committed administrative traffic offence, providing a photo or video footage of the violation committed.