Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A cloverleaf interchange is a two-level interchange in which left turns (in countries that drive on the right) are handled by loop roads (U.S.: ramps, UK: slip roads). To go left (in right-hand traffic), vehicles first pass either over or under the other road, then turn right onto a one-way three-fourths loop ramp (270°) and merge onto the intersecting road.
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