Resumen
Roundabouts begin to be used more often instead of crossroads with traffic signals. A simulated model was applied for the performance assessment of a roundabout. The modeling of a roundabout confirmed the existence of big transport delays at this site of the street and road network. To prevent congestion at roundabouts it is necessary to know that crosswalks located in direct proximity to driveways/exit roads of a roundabout seriously reduce its traffic capacity.