Overtaking is a high risk maneuver for road users, still drivers often accept this risk, moreover they often commit irregular overtaking maneuvers. The paper gives some overview on traffic violations and irregular overtaking maneuvers. Left-turn lanes on major roads are usual elements of un-signalized at-grade junctions on two-lane roads outside urban areas. In several cases the left-turn lane, built for safety reasons, has the unintended negative effect, of becoming a dangerous spot. The paper analyses overtaking maneuvers at left-turn lanes on Hungarian roads. Site surveys were completed at typical sites outside built-up areas. Relationships between the frequency of irregular maneuvers, accident statistics, geometric parameters and traffic data are analyzed.