Cross roads with one deck of rectangular road surface and two-end upward convex step passage

A layer of rectangle road surface and a crossroad with two convex rank passages warping upwards without the direction of a traffic light. A second layer or a third layer of rectangle road surface and the crossroad with two convex rank passages warping upwards can be built on the crossroad road surface of the four, six or eight roadways without dismantling the houses and widening the road surface. This crossroad does not allow bicycle or foot passenger to go get across, but allows electric cars and cars which arrive at the crossroad simultaneously to realize right turn, straight going, left turn and reversing end for end without a mutual bump of 90 degrees between the electric cars and the cars, among cars and among electric cars and a mutual collision of 180 degrees. All the cars run on their own roadways fleetly without wait and jam.