Increasing the number of vehicles on city roads are the cause of the increase in the number of traffic accidents. The highest number of traffic accidents occur at intersections. The way that traffic control at the intersection is managed, significantly effects on the number of traffic accidents, so it is important to determine how to manage traffic. Traffic lights to generate multiple effects, the additional incorporation of indicators and the phases of the life cycle to traffic lights are created different views on the appropriateness of installation. The aim of this study was to investigate the influence of visual indicators duration of the individual phases in the work of the traffic lights at the number of traffic accidents at the intersection and compare the state of traffic safety at the intersection before and after application of indicators. In the first chapter of this paper describes the types of orthogonal intersection, methods of traffic control at the intersection as well as procedures with the vehicle in the intersection and possible point of collision in these proceedings. In the next section displays the characteristics of this way of managing traffic in traffic-orthogonal intersection of Zrinski and Frankopan and Vidovski square in Varaždin. At the intersection with the traffic light placed indicators duration of certain phases of operation of traffic lights and traffic lights work program was established to Webster's method. The final chapter gives an overview of the research status of traffic safety at this intersection before and after setting visual indicators duration of the individual phases in the cycle of traffic lights. The study was conducted by collecting data on the number and type of traffic accidents in a period of time, processing of these data and comparing them to form the mounting evidence of the justification indicator.