Cloverleaf is a type of road interchange that allows for the smooth flow of traffic between two highways. It features a series of circular ramps that connect the roads, enabling vehicles to change directions without stopping. This design helps reduce congestion and improve safety by minimizing the need for traffic signals. The Cloverleaf design was popularized in the mid-20th century and is commonly found in urban areas across the United States. It is particularly useful in areas with high traffic volumes, as it efficiently manages the merging and diverging of vehicles, making travel more convenient for drivers.