1. A method of automatic vehicular traffic flow control, comprising the steps of: defining a controlled area that includes a conflict zone having a plurality of vehicular traffic streams passing therethrough in different directions and entering the controlled area at respective initial speeds, wherein vehicles belonging to different ones of the vehicular traffic streams contend for occupancy of the conflict zone; and interleaving the vehicular traffic streams at the conflict zone under automatic control while varying respective zone speeds of the vehicular traffic streams such that the vehicular traffic streams freely flow through the conflict zone without traffic backup, wherein the zone speeds are not less than the respective initial speeds.