Word Study
cloverleaf
CIDE DICTIONARY
cloverleaf, n.
a highway interchange between two roads in which the connecting road pattern resembles a four-leaf clover, and which allows moving from one road to another without left-hand turns. One road passes over the other, and the exit from one highway and entrance into the second highway proceeds from the right-hand lane in all directions. [WordNet 1.5]
For further exploring for "cloverleaf" in Webster Dictionary Online