Phase diagrams on an unsignalized intersection for the cases of different maximum velocities of vehicles

► This paper studies traffic flow on an unsignalized intersection. ► The cases of unequal vehicle maximum velocities on both roads are considered. ► The phase diagrams with detailed flow formulas of all the regions are constructed. ► The topology of phase diagrams is related to the update rules of both roads. ► It is also related to their maximum velocities of vehicles on both roads.