A common approach in traffic signal timing design at isolated intersections is to assume homogeneous traffic flows and ideal geometric conditions, and then to apply adjustment factors so that variations from the ideal conditions are considered. Since the ideal and adjustment values are usually developed from empirical field data, the final result may not accurately reflect the true local situation. Fine tuning, primarily based on personal judgment, is therefore almost always required because local conditions differ from study conditions. This paper presents a method which relies solely on an empirical traffic factor, namely queue distance, to determine the green time. Field surveys at three intersections were conducted to establish the equations used in this method. The coefficients of the equations are interpreted. The applications of this method to supplement the fine tuning are presented. The potential application of this method on traffic responsive control is also proposed. Key words: traffic signal, queue, regression analysis, pretimed signal, traffic responsive control.