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  2. Grade separation - Wikipedia

    en.wikipedia.org/wiki/Grade_separation

    On roadways with grade-separated interchanges, weaving is a result of placing an exit ramp a short distance after an entry ramp, causing conflicts between traffic attempting to leave the roadway at the next junction and traffic attempting to enter from the previous junction.

  3. Interchange (road) - Wikipedia

    en.wikipedia.org/wiki/Interchange_(road)

    In the field of road transport, an interchange (American English) or a grade-separated junction (British English) is a road junction that uses grade separations to allow for the movement of traffic between two or more roadways or highways, using a system of interconnecting roadways to permit traffic on at least one of the routes to pass through ...

  4. Stack interchange - Wikipedia

    en.wikipedia.org/wiki/Stack_interchange

    A directional interchange is a grade separated junction between two roads where all turns that require crossing over or under the opposite road's lanes of travel to complete the turn utilize ramps that make a direct or semi-direct connection. The difference between direct and semi-direct connections is how much the motorist deviates from the ...

  5. Controlled-access highway - Wikipedia

    en.wikipedia.org/wiki/Controlled-access_highway

    Achieving such free flow requires the construction of many overpasses, underpasses, and ramp systems. The advantage of grade-separated interchanges is that freeway drivers can almost always maintain their speed at junctions since they do not need to yield to vehicles crossing perpendicular to mainline traffic.

  6. Diamond interchange - Wikipedia

    en.wikipedia.org/wiki/Diamond_interchange

    A typical diamond interchange. The freeway itself is grade-separated from the minor road, one crossing the other over a bridge.Approaching the interchange from either direction, an off-ramp diverges only slightly from the freeway and runs directly across the minor road, becoming an on-ramp that returns to the freeway in similar fashion.

  7. Partial cloverleaf interchange - Wikipedia

    en.wikipedia.org/wiki/Partial_cloverleaf_interchange

    A cloverleaf interchange has eight ramps, as does a stack interchange. They are fully grade separated, unlike a parclo, and have traffic flow without stops on all ramps and throughways. A parclo generally has either four or six ramps but less commonly has five or seven ramps.

  8. Diverging diamond interchange - Wikipedia

    en.wikipedia.org/wiki/Diverging_diamond_interchange

    The crossovers may employ one-side overpasses or be at-grade and controlled by traffic lights. The diverging diamond interchange has advantages in both efficiency and safety, and was cited by Popular Science as one of the best engineering innovations of 2009 [ 3 ] and in the U.S. has been promoted as part of the Federal Highway Administration's ...

  9. Roundabout interchange - Wikipedia

    en.wikipedia.org/wiki/Roundabout_interchange

    The three-level stacked roundabout is a variation on the roundabout interchange in which both roads are grade-separated. It is similar to the three-level diamond interchange except that the small square of that latter interchange is enlarged to a true roundabout. If the roundabout is sufficiently large, the interchange may require only two ...