Combined bridge or combined tunnel with two right-hand-running-system lane-changing-type bifurcate units

The utility model relates to a combined bridge or a combined tunnel with two right-hand-running-system lane-changing-type bifurcate units. The combined bridge or the combined tunnel is a smooth combined bridge or a smooth combined tunnel which consists of two independent bifurcate bridges or tunnels and can prevent straight running motor vehicles and left-turn motor vehicles on two opposite sides of a crossroad from crossly occupying lanes. The abreast section of a straight running bridge and a left-turn bridge on the same ground branch lane is turned left at a high-position area to become a lane changing section, wherein the high-position area is arranged between a bifurcating point and the lane changing section; and sections from the straight bridge grounding ends to the lane changing sections of two lane-changing bifurcate bridges which are bifurcated in the same direction are arranged in a manner adjacent to each other to form the combined bridge. The structure of the combined tunnel is the same as the combined bridge. The combined bridge or the combined tunnel with two right-hand-running-system lane-changing-type bifurcate units has the advantages that only one layer of combined bridge or tunnel is used and the problem that the straight running vehicles and the left-turn vehicles on two ground branch lanes on two opposite sides of the crossroad crossly occupy the lanes can be solved; and the left-turn vehicles can directly turn left without detouring and 70 percent of traffic jams are avoided.