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Traffic signals at urban road junctions are sometimes static in nature and vehicles are to wait for a fixed time in the road junctions even if other sides of the junction are free or have comparatively fewer vehicles. Thus vehicles on one side of the junction may experience longer waiting times though other side may be less number of vehicles causing increased congestion on the road junctions. Therefore, if optimization is done for the waiting times, the dynamic signal can be assigned to junctions depending on number of vehicles in each side. This paper emphasizes a comparative study of dynamic traffic control signals at city road junctions using different methods with working principles, equipment and technology with typical applications. This paper also proposes a hybrid model to compute the Dynamic Green Signal time for the vehicles waiting in queues on urban road junctions which ensures efficient traffic flow at road junctions.