Directional T interchanges use fly/over/underpass ramps for both connecting and mainline segments. They require an average amount of land and costs. Cloverleaf interchange is typically a two-level, four-way interchange where all turns across opposing non-directional loop ramps handle traffic.
The diamond interchange is economical in use of materials and land than other interchange designs. Basketweave interchange is commonly found on highways using a collector/express system of running collector-distributor lanes. Trumpet interchanges are used where one highway terminates at another highway.
The four types of interstate interchanges are as follows:
A. Cloverleaf- eliminates left turn and cross traffic
B. Diamond-little traffic crosses a busy expressway
C. Trumpet- side road forms a t intersection with an expressway
D. Directional-complicated intersections with high volume of traffic, diff directions