This highway weaving free cloverleaf type interchange for a highway crossing under a street accommodates traffic from a plurality of traveled ways which include a first traveled way for traffic traveling in a first direction, a second traveled way for traffic traveling in a direction opposite to the first direction, a third traveled way for traffic traveling in a direction intersecting the first and second traveled ways, and a fourth traveled way for traffic traveling in a direction opposite to the traffic traveling on the third traveled way. The first and second traveled ways cross under the third and fourth traveled ways in a first area Each of the first and second traveled ways has a design speed compatible to a highway or freeway design speed, or is designed according to highway or freeway design standards. Each of the third and fourth traveled ways has a design speed compatible to the design speed of a street, road, or conventional highway or is designed according to street, road, or conventional highway design standards. The first traveled way left turn ramp crosses the third traveled way left turn ramp and is disposed at an elevation distinct relative to that of the third traveled way left turn ramp in their overlapping area determined by bird's-eye view to enable traffic on the two ramps to cross each other without weaving. The third and fourth traveled ways are disposed in elevation between the first traveled way left turn ramp and the third traveled way left turn ramp to allow traffic on the third and fourth traveled ways to cross traffic on the two ramps without weaving. The second traveled way left turn ramp crosses the fourth traveled way left turn ramp and is disposed at an elevation distinct relative to that of the fourth traveled way left turn ramp in their overlapping area determined by bird's-eye view to enable traffic on the two ramps to cross each other without weaving. The third and fourth traveled ways are disposed in elevation between the second traveled way left turn ramp and the fourth traveled way left turn ramp to allow traffic on the third and fourth traveled ways to cross traffic on the two ramps without weaving. This interchange has a higher efficiency and a lower accident rate than a conventional cloverleaf type interchange for a highway crossing under a street. It uses only about the same amount of Right of Way as is commonly available for a conventional cloverleaf type interchange for a highway crossing under a street. It also has higher efficiency and requires less Right of Way at the street level than the interchange in U.S. Pat. No. 4,861,184 for a highway crossing under a street.
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