A road intersection comprising a main road having at least two traffic lanes in each direction and an inside and an outside lane in each direction having parallel center lines, and a secondary road having at least one traffic lane in each direction intersecting said main road. There is provided a traffic island in the intersection extending parallel to and disposed between the inside lanes of the main road so as to block the lanes of the secondary road. A pair of opposed detour roads is disposed on either side of the intersection, and each detour road is located vertically above or below the main road in a manner such that the land space lying vertically under each detour road is substantially within the boundaries of the land space lying vertically under the main road.
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