Cloverstack interchanges are hybrid interchanges, using loop ramps like cloverleaves to serve slower or less occupied traffic flow and flyover ramps like stack interchanges to serve faster and higher occupied traffic flow. If local and express ways serving the same directions and each roadway is connected righthand to the interchange, extra ramps are installed.
The cloverstack design is commonly used to upgrade cloverleaf interchanges to increase their capacity and eliminate weaving.
Adapted from http://en.wikipedia.org/wiki/Interchange_%28road%29
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