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Existing traffic control strategies at signalized intersections aim at the optimization of signal timing parameters while assuming fixed lane assignments to the movements at each approach. Such control results in the waste of time-space resources especially at intersections where significant variations in the demand of turning and through traffic movements occur with time. Such demand variations with fixed space allocation per movement will lead to longer cycle lengths and excessive delays. This study aims to develop a model that integrates the optimization of space allocation (dynamic lane grouping) with the optimization of signal timing parameters for the whole intersection in order to improve its mobility. The effectiveness of dynamic lane grouping is evaluated using collected traffic data at an isolated signalized intersection in Dhahran City, Saudi Arabia. MATLAB environment is utilized to build the model in which …